box: Remove 'padding' child property

32 files changed, 151 insertions, 143 deletions

diff --git a/demos/gtk-demo/assistant.c b/demos/gtk-demo/assistant.c
index addf13c875..22b19bc829 100644
--- a/demos/gtk-demo/assistant.c
+++ b/demos/gtk-demo/assistant.c
@@ -97,12 +97,12 @@ create_page1 (GtkWidget *assistant)
   gtk_container_set_border_width (GTK_CONTAINER (box), 12);
 
   label = gtk_label_new ("You must fill out this entry to continue:");
-  gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE);
 
   entry = gtk_entry_new ();
   gtk_entry_set_activates_default (GTK_ENTRY (entry), TRUE);
   gtk_widget_set_valign (entry, GTK_ALIGN_CENTER);
-  gtk_box_pack_start (GTK_BOX (box), entry, TRUE, TRUE, 0);
+  gtk_box_pack_start (GTK_BOX (box), entry, TRUE, TRUE);
   g_signal_connect (G_OBJECT (entry), "changed",
                     G_CALLBACK (on_entry_changed), assistant);
 
@@ -122,7 +122,7 @@ create_page2 (GtkWidget *assistant)
 
   checkbutton = gtk_check_button_new_with_label ("This is optional data, you may continue "
                                                  "even if you do not check this");
-  gtk_box_pack_start (GTK_BOX (box), checkbutton, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (box), checkbutton, FALSE, FALSE);
 
   gtk_widget_show_all (box);
   gtk_assistant_append_page (GTK_ASSISTANT (assistant), box);
diff --git a/demos/gtk-demo/button_box.c b/demos/gtk-demo/button_box.c
index 7d383d383f..be4e03353d 100644
--- a/demos/gtk-demo/button_box.c
+++ b/demos/gtk-demo/button_box.c
@@ -68,64 +68,66 @@ do_button_box (GtkWidget *do_widget)
     gtk_container_add (GTK_CONTAINER (window), main_vbox);
 
     frame_horz = gtk_frame_new ("Horizontal Button Boxes");
-    gtk_box_pack_start (GTK_BOX (main_vbox), frame_horz, TRUE, TRUE, 10);
+    gtk_widget_set_margin_top (frame_horz, 10);
+    gtk_widget_set_margin_bottom (frame_horz, 10);
+    gtk_box_pack_start (GTK_BOX (main_vbox), frame_horz, TRUE, TRUE);
 
-    vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+    vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 10);
     gtk_container_set_border_width (GTK_CONTAINER (vbox), 10);
     gtk_container_add (GTK_CONTAINER (frame_horz), vbox);
 
     gtk_box_pack_start (GTK_BOX (vbox),
                         create_bbox (TRUE, "Spread", 40, GTK_BUTTONBOX_SPREAD),
-                        TRUE, TRUE, 0);
+                        TRUE, TRUE);
 
     gtk_box_pack_start (GTK_BOX (vbox),
                         create_bbox (TRUE, "Edge", 40, GTK_BUTTONBOX_EDGE),
-                        TRUE, TRUE, 5);
+                        TRUE, TRUE);
 
     gtk_box_pack_start (GTK_BOX (vbox),
                         create_bbox (TRUE, "Start", 40, GTK_BUTTONBOX_START),
-                        TRUE, TRUE, 5);
+                        TRUE, TRUE);
 
     gtk_box_pack_start (GTK_BOX (vbox),
                         create_bbox (TRUE, "End", 40, GTK_BUTTONBOX_END),
-                        TRUE, TRUE, 5);
+                        TRUE, TRUE);
 
     gtk_box_pack_start (GTK_BOX (vbox),
                         create_bbox (TRUE, "Center", 40, GTK_BUTTONBOX_CENTER),
-                        TRUE, TRUE, 5);
+                        TRUE, TRUE);
 
     gtk_box_pack_start (GTK_BOX (vbox),
                         create_bbox (TRUE, "Expand", 0, GTK_BUTTONBOX_EXPAND),
-                        TRUE, TRUE, 5);
+                        TRUE, TRUE);
 
     frame_vert = gtk_frame_new ("Vertical Button Boxes");
-    gtk_box_pack_start (GTK_BOX (main_vbox), frame_vert, TRUE, TRUE, 10);
+    gtk_box_pack_start (GTK_BOX (main_vbox), frame_vert, TRUE, TRUE);
 
-    hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
+    hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
     gtk_container_set_border_width (GTK_CONTAINER (hbox), 10);
     gtk_container_add (GTK_CONTAINER (frame_vert), hbox);
 
     gtk_box_pack_start (GTK_BOX (hbox),
                         create_bbox (FALSE, "Spread", 10, GTK_BUTTONBOX_SPREAD),
-                        TRUE, TRUE, 0);
+                        TRUE, TRUE);
 
     gtk_box_pack_start (GTK_BOX (hbox),
                         create_bbox (FALSE, "Edge", 10, GTK_BUTTONBOX_EDGE),
-                        TRUE, TRUE, 5);
+                        TRUE, TRUE);
 
     gtk_box_pack_start (GTK_BOX (hbox),
                         create_bbox (FALSE, "Start", 10, GTK_BUTTONBOX_START),
-                        TRUE, TRUE, 5);
+                        TRUE, TRUE);
 
     gtk_box_pack_start (GTK_BOX (hbox),
                         create_bbox (FALSE, "End", 10, GTK_BUTTONBOX_END),
-                        TRUE, TRUE, 5);
+                        TRUE, TRUE);
     gtk_box_pack_start (GTK_BOX (hbox),
                         create_bbox (FALSE, "Center", 10, GTK_BUTTONBOX_CENTER),
-                        TRUE, TRUE, 5);
+                        TRUE, TRUE);
     gtk_box_pack_start (GTK_BOX (hbox),
                         create_bbox (FALSE, "Expand", 0, GTK_BUTTONBOX_EXPAND),
-                        TRUE, TRUE, 5);
+                        TRUE, TRUE);
   }
 
   if (!gtk_widget_get_visible (window))
diff --git a/demos/gtk-demo/changedisplay.c b/demos/gtk-demo/changedisplay.c
index 37c364f3e8..c8a4487eaf 100644
--- a/demos/gtk-demo/changedisplay.c
+++ b/demos/gtk-demo/changedisplay.c
@@ -313,7 +313,7 @@ create_frame (ChangeDisplayInfo *info,
                                   GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
   gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrollwin),
                                        GTK_SHADOW_IN);
-  gtk_box_pack_start (GTK_BOX (hbox), scrollwin, TRUE, TRUE, 0);
+  gtk_box_pack_start (GTK_BOX (hbox), scrollwin, TRUE, TRUE);
 
   *tree_view = gtk_tree_view_new ();
   gtk_tree_view_set_headers_visible (GTK_TREE_VIEW (*tree_view), FALSE);
@@ -323,7 +323,7 @@ create_frame (ChangeDisplayInfo *info,
   gtk_tree_selection_set_mode (selection, GTK_SELECTION_BROWSE);
 
   *button_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
-  gtk_box_pack_start (GTK_BOX (hbox), *button_vbox, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (hbox), *button_vbox, FALSE, FALSE);
 
   if (!info->size_group)
     info->size_group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
@@ -363,11 +363,11 @@ create_display_frame (ChangeDisplayInfo *info)
 
   button = left_align_button_new ("_Open...");
   g_signal_connect (button, "clicked",  G_CALLBACK (open_display_cb), info);
-  gtk_box_pack_start (GTK_BOX (button_vbox), button, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (button_vbox), button, FALSE, FALSE);
 
   button = left_align_button_new ("_Close");
   g_signal_connect (button, "clicked",  G_CALLBACK (close_display_cb), info);
-  gtk_box_pack_start (GTK_BOX (button_vbox), button, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (button_vbox), button, FALSE, FALSE);
 
   info->display_model = (GtkTreeModel *)gtk_list_store_new (DISPLAY_NUM_COLUMNS,
                                                             G_TYPE_STRING,
@@ -540,10 +540,10 @@ do_changedisplay (GtkWidget *do_widget)
 
       vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
       gtk_container_set_border_width (GTK_CONTAINER (vbox), 8);
-      gtk_box_pack_start (GTK_BOX (content_area), vbox, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (content_area), vbox, TRUE, TRUE);
 
       frame = create_display_frame (info);
-      gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE);
 
       initialize_displays (info);
 
diff --git a/demos/gtk-demo/clipboard.c b/demos/gtk-demo/clipboard.c
index 8bb44e9ed9..8e31c5185b 100644
--- a/demos/gtk-demo/clipboard.c
+++ b/demos/gtk-demo/clipboard.c
@@ -225,45 +225,45 @@ do_clipboard (GtkWidget *do_widget)
 
       label = gtk_label_new ("\"Copy\" will copy the text\nin the entry to the clipboard");
 
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
       gtk_container_set_border_width (GTK_CONTAINER (hbox), 8);
-      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE);
 
       /* Create the first entry */
       entry = gtk_entry_new ();
-      gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE);
 
       /* Create the button */
       button = gtk_button_new_with_mnemonic (_("_Copy"));
-      gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE);
       g_signal_connect (button, "clicked",
                         G_CALLBACK (copy_button_clicked), entry);
 
       label = gtk_label_new ("\"Paste\" will paste the text from the clipboard to the entry");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
       gtk_container_set_border_width (GTK_CONTAINER (hbox), 8);
-      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE);
 
       /* Create the second entry */
       entry = gtk_entry_new ();
-      gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE);
 
       /* Create the button */
       button = gtk_button_new_with_mnemonic (_("_Paste"));
-      gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE);
       g_signal_connect (button, "clicked",
                         G_CALLBACK (paste_button_clicked), entry);
 
       label = gtk_label_new ("Images can be transferred via the clipboard, too");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
       gtk_container_set_border_width (GTK_CONTAINER (hbox), 8);
-      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE);
 
       /* Create the first image */
       image = gtk_image_new_from_icon_name ("dialog-warning",
diff --git a/demos/gtk-demo/colorsel.c b/demos/gtk-demo/colorsel.c
index c00d50357d..4df48b634f 100644
--- a/demos/gtk-demo/colorsel.c
+++ b/demos/gtk-demo/colorsel.c
@@ -86,7 +86,7 @@ do_colorsel (GtkWidget *do_widget)
 
       frame = gtk_frame_new (NULL);
       gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
-      gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE);
 
       da = gtk_drawing_area_new ();
 
@@ -101,7 +101,7 @@ do_colorsel (GtkWidget *do_widget)
       gtk_widget_set_halign (button, GTK_ALIGN_END);
       gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
 
-      gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE);
 
       g_signal_connect (button, "clicked",
                         G_CALLBACK (change_color_callback), NULL);
diff --git a/demos/gtk-demo/combobox.c b/demos/gtk-demo/combobox.c
index 7044c8fb19..09d50e49cb 100644
--- a/demos/gtk-demo/combobox.c
+++ b/demos/gtk-demo/combobox.c
@@ -327,7 +327,7 @@ do_combobox (GtkWidget *do_widget)
      *  insensitive rows
      */
     frame = gtk_frame_new ("Items with icons");
-    gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+    gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE);
 
     box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
     gtk_container_set_border_width (GTK_CONTAINER (box), 5);
@@ -368,7 +368,7 @@ do_combobox (GtkWidget *do_widget)
     /* A combobox demonstrating trees.
      */
     frame = gtk_frame_new ("Where are we ?");
-    gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+    gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE);
 
     box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
     gtk_container_set_border_width (GTK_CONTAINER (box), 5);
@@ -396,7 +396,7 @@ do_combobox (GtkWidget *do_widget)
 
     /* A GtkComboBoxEntry with validation */
     frame = gtk_frame_new ("Editable");
-    gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+    gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE);
 
     box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
     gtk_container_set_border_width (GTK_CONTAINER (box), 5);
@@ -414,7 +414,7 @@ do_combobox (GtkWidget *do_widget)
 
     /* A combobox with string IDs */
     frame = gtk_frame_new ("String IDs");
-    gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+    gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE);
 
     box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
     gtk_container_set_border_width (GTK_CONTAINER (box), 5);
diff --git a/demos/gtk-demo/cursors.c b/demos/gtk-demo/cursors.c
index eb922a3ef4..cab6333347 100644
--- a/demos/gtk-demo/cursors.c
+++ b/demos/gtk-demo/cursors.c
@@ -27,13 +27,13 @@ add_section (GtkWidget   *box,
   gtk_label_set_xalign (GTK_LABEL (label), 0.0);
   gtk_widget_set_margin_top (label, 10);
   gtk_widget_set_margin_bottom (label, 10);
-  gtk_box_pack_start (GTK_BOX (box), label, FALSE, TRUE, 0);
+  gtk_box_pack_start (GTK_BOX (box), label, FALSE, TRUE);
   section = gtk_flow_box_new ();
   gtk_widget_set_halign (section, GTK_ALIGN_START);
   gtk_flow_box_set_selection_mode (GTK_FLOW_BOX (section), GTK_SELECTION_NONE);
   gtk_flow_box_set_min_children_per_line (GTK_FLOW_BOX (section), 2);
   gtk_flow_box_set_max_children_per_line (GTK_FLOW_BOX (section), 20);
-  gtk_box_pack_start (GTK_BOX (box), section, FALSE, TRUE, 0);
+  gtk_box_pack_start (GTK_BOX (box), section, FALSE, TRUE);
 
   return section;
 }
diff --git a/demos/gtk-demo/dialog.c b/demos/gtk-demo/dialog.c
index 0eb1c62397..a632519717 100644
--- a/demos/gtk-demo/dialog.c
+++ b/demos/gtk-demo/dialog.c
@@ -57,15 +57,15 @@ interactive_dialog_clicked (GtkButton *button,
 
   hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 8);
   gtk_container_set_border_width (GTK_CONTAINER (hbox), 8);
-  gtk_box_pack_start (GTK_BOX (content_area), hbox, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (content_area), hbox, FALSE, FALSE);
 
   image = gtk_image_new_from_icon_name ("dialog-question", GTK_ICON_SIZE_DIALOG);
-  gtk_box_pack_start (GTK_BOX (hbox), image, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (hbox), image, FALSE, FALSE);
 
   table = gtk_grid_new ();
   gtk_grid_set_row_spacing (GTK_GRID (table), 4);
   gtk_grid_set_column_spacing (GTK_GRID (table), 4);
-  gtk_box_pack_start (GTK_BOX (hbox), table, TRUE, TRUE, 0);
+  gtk_box_pack_start (GTK_BOX (hbox), table, TRUE, TRUE);
   label = gtk_label_new_with_mnemonic ("_Entry 1");
   gtk_grid_attach (GTK_GRID (table), label, 0, 0, 1, 1);
   local_entry1 = gtk_entry_new ();
@@ -125,30 +125,30 @@ do_dialog (GtkWidget *do_widget)
 
       /* Standard message dialog */
       hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 8);
-      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE);
       button = gtk_button_new_with_mnemonic ("_Message Dialog");
       g_signal_connect (button, "clicked",
                         G_CALLBACK (message_dialog_clicked), NULL);
-      gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), button, FALSE, FALSE);
 
       gtk_box_pack_start (GTK_BOX (vbox), gtk_separator_new (GTK_ORIENTATION_HORIZONTAL),
-                          FALSE, FALSE, 0);
+                          FALSE, FALSE);
 
       /* Interactive dialog*/
       hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 8);
-      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE);
       vbox2 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
 
       button = gtk_button_new_with_mnemonic ("_Interactive Dialog");
       g_signal_connect (button, "clicked",
                         G_CALLBACK (interactive_dialog_clicked), NULL);
-      gtk_box_pack_start (GTK_BOX (hbox), vbox2, FALSE, FALSE, 0);
-      gtk_box_pack_start (GTK_BOX (vbox2), button, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), vbox2, FALSE, FALSE);
+      gtk_box_pack_start (GTK_BOX (vbox2), button, FALSE, FALSE);
 
       table = gtk_grid_new ();
       gtk_grid_set_row_spacing (GTK_GRID (table), 4);
       gtk_grid_set_column_spacing (GTK_GRID (table), 4);
-      gtk_box_pack_start (GTK_BOX (hbox), table, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), table, FALSE, FALSE);
 
       label = gtk_label_new_with_mnemonic ("_Entry 1");
       gtk_grid_attach (GTK_GRID (table), label, 0, 0, 1, 1);
diff --git a/demos/gtk-demo/drawingarea.c b/demos/gtk-demo/drawingarea.c
index 3b7da92dcd..8023bb3423 100644
--- a/demos/gtk-demo/drawingarea.c
+++ b/demos/gtk-demo/drawingarea.c
@@ -228,11 +228,11 @@ do_drawingarea (GtkWidget *do_widget)
       label = gtk_label_new (NULL);
       gtk_label_set_markup (GTK_LABEL (label),
                             "<u>Checkerboard pattern</u>");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       frame = gtk_frame_new (NULL);
       gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
-      gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE);
 
       da = gtk_drawing_area_new ();
       /* set a minimum size */
@@ -250,11 +250,11 @@ do_drawingarea (GtkWidget *do_widget)
       label = gtk_label_new (NULL);
       gtk_label_set_markup (GTK_LABEL (label),
                             "<u>Scribble area</u>");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       frame = gtk_frame_new (NULL);
       gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
-      gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE);
 
       da = gtk_drawing_area_new ();
       /* set a minimum size */
diff --git a/demos/gtk-demo/editable_cells.c b/demos/gtk-demo/editable_cells.c
index f57ae5cdfe..d6acc49eb7 100644
--- a/demos/gtk-demo/editable_cells.c
+++ b/demos/gtk-demo/editable_cells.c
@@ -358,7 +358,7 @@ do_editable_cells (GtkWidget *do_widget)
 
       gtk_box_pack_start (GTK_BOX (vbox),
                           gtk_label_new ("Shopping list (you can edit the cells!)"),
-                          FALSE, FALSE, 0);
+                          FALSE, FALSE);
 
       sw = gtk_scrolled_window_new (NULL, NULL);
       gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (sw),
@@ -366,7 +366,7 @@ do_editable_cells (GtkWidget *do_widget)
       gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
                                       GTK_POLICY_AUTOMATIC,
                                       GTK_POLICY_AUTOMATIC);
-      gtk_box_pack_start (GTK_BOX (vbox), sw, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), sw, TRUE, TRUE);
 
       /* create models */
       items_model = create_items_model ();
@@ -387,17 +387,17 @@ do_editable_cells (GtkWidget *do_widget)
       /* some buttons */
       hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 4);
       gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
-      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE);
 
       button = gtk_button_new_with_label ("Add item");
       g_signal_connect (button, "clicked",
                         G_CALLBACK (add_item), treeview);
-      gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE);
 
       button = gtk_button_new_with_label ("Remove item");
       g_signal_connect (button, "clicked",
                         G_CALLBACK (remove_item), treeview);
-      gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE);
 
       gtk_window_set_default_size (GTK_WINDOW (window), 320, 200);
     }
diff --git a/demos/gtk-demo/entry_buffer.c b/demos/gtk-demo/entry_buffer.c
index d4863e3896..ef3e15ee3e 100644
--- a/demos/gtk-demo/entry_buffer.c
+++ b/demos/gtk-demo/entry_buffer.c
@@ -34,19 +34,19 @@ do_entry_buffer (GtkWidget *do_widget)
       label = gtk_label_new (NULL);
       gtk_label_set_markup (GTK_LABEL (label),
                             "Entries share a buffer. Typing in one is reflected in the other.");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       /* Create a buffer */
       buffer = gtk_entry_buffer_new (NULL, 0);
 
       /* Create our first entry */
       entry = gtk_entry_new_with_buffer (buffer);
-      gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE);
 
       /* Create the second entry */
       entry = gtk_entry_new_with_buffer (buffer);
       gtk_entry_set_visibility (GTK_ENTRY (entry), FALSE);
-      gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE);
 
       g_object_unref (buffer);
     }
diff --git a/demos/gtk-demo/entry_completion.c b/demos/gtk-demo/entry_completion.c
index cb822356b5..0ca4cbe5ac 100644
--- a/demos/gtk-demo/entry_completion.c
+++ b/demos/gtk-demo/entry_completion.c
@@ -60,11 +60,11 @@ do_entry_completion (GtkWidget *do_widget)
 
       label = gtk_label_new (NULL);
       gtk_label_set_markup (GTK_LABEL (label), "Completion demo, try writing <b>total</b> or <b>gnome</b> for example.");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       /* Create our entry */
       entry = gtk_entry_new ();
-      gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE);
 
       /* Create the completion object */
       completion = gtk_entry_completion_new ();
diff --git a/demos/gtk-demo/expander.c b/demos/gtk-demo/expander.c
index 2a2dff8b95..9ec710c506 100644
--- a/demos/gtk-demo/expander.c
+++ b/demos/gtk-demo/expander.c
@@ -85,7 +85,7 @@ do_expander (GtkWidget *do_widget)
                                 "resize the window. Do it already !", -1);
       gtk_container_add (GTK_CONTAINER (sw), tv);
       gtk_container_add (GTK_CONTAINER (expander), sw);
-      gtk_box_pack_end (GTK_BOX (area), expander, TRUE, TRUE, 0);
+      gtk_box_pack_end (GTK_BOX (area), expander, TRUE, TRUE);
       gtk_widget_show_all (expander);
       g_signal_connect (expander, "notify::expanded",
                         G_CALLBACK (expander_cb), window);
diff --git a/demos/gtk-demo/iconview.c b/demos/gtk-demo/iconview.c
index 67cdabb43c..2ebe54f1e8 100644
--- a/demos/gtk-demo/iconview.c
+++ b/demos/gtk-demo/iconview.c
@@ -266,7 +266,7 @@ do_iconview (GtkWidget *do_widget)
       gtk_container_add (GTK_CONTAINER (window), vbox);
 
       tool_bar = gtk_toolbar_new ();
-      gtk_box_pack_start (GTK_BOX (vbox), tool_bar, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), tool_bar, FALSE, FALSE);
 
       up_button = gtk_tool_button_new (NULL, NULL);
       gtk_tool_button_set_label (GTK_TOOL_BUTTON (up_button), _("_Up"));
@@ -291,7 +291,7 @@ do_iconview (GtkWidget *do_widget)
                                       GTK_POLICY_AUTOMATIC,
                                       GTK_POLICY_AUTOMATIC);
 
-      gtk_box_pack_start (GTK_BOX (vbox), sw, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), sw, TRUE, TRUE);
 
       /* Create the store and fill it with the contents of '/' */
       parent = g_strdup ("/");
diff --git a/demos/gtk-demo/images.c b/demos/gtk-demo/images.c
index 2561c7d9bf..a3e9c7a0a6 100644
--- a/demos/gtk-demo/images.c
+++ b/demos/gtk-demo/images.c
@@ -356,13 +356,13 @@ do_images (GtkWidget *do_widget)
       label = gtk_label_new (NULL);
       gtk_label_set_markup (GTK_LABEL (label),
                             "<u>Image loaded from a file</u>");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       frame = gtk_frame_new (NULL);
       gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
       gtk_widget_set_halign (frame, GTK_ALIGN_CENTER);
       gtk_widget_set_valign (frame, GTK_ALIGN_CENTER);
-      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE);
 
       image = gtk_image_new_from_icon_name ("gtk3-demo", GTK_ICON_SIZE_DIALOG);
 
@@ -374,13 +374,13 @@ do_images (GtkWidget *do_widget)
       label = gtk_label_new (NULL);
       gtk_label_set_markup (GTK_LABEL (label),
                             "<u>Animation loaded from a file</u>");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       frame = gtk_frame_new (NULL);
       gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
       gtk_widget_set_halign (frame, GTK_ALIGN_CENTER);
       gtk_widget_set_valign (frame, GTK_ALIGN_CENTER);
-      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE);
 
       image = gtk_image_new_from_resource ("/images/floppybuddy.gif");
 
@@ -391,13 +391,13 @@ do_images (GtkWidget *do_widget)
       label = gtk_label_new (NULL);
       gtk_label_set_markup (GTK_LABEL (label),
                             "<u>Symbolic themed icon</u>");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       frame = gtk_frame_new (NULL);
       gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
       gtk_widget_set_halign (frame, GTK_ALIGN_CENTER);
       gtk_widget_set_valign (frame, GTK_ALIGN_CENTER);
-      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE);
 
       gicon = g_themed_icon_new_with_default_fallbacks ("battery-caution-charging-symbolic");
       image = gtk_image_new_from_gicon (gicon, GTK_ICON_SIZE_DIALOG);
@@ -410,13 +410,13 @@ do_images (GtkWidget *do_widget)
       label = gtk_label_new (NULL);
       gtk_label_set_markup (GTK_LABEL (label),
                             "<u>Progressive image loading</u>");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       frame = gtk_frame_new (NULL);
       gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
       gtk_widget_set_halign (frame, GTK_ALIGN_CENTER);
       gtk_widget_set_valign (frame, GTK_ALIGN_CENTER);
-      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE);
 
       /* Create an empty image for now; the progressive loader
        * will create the pixbuf and fill it in.
@@ -428,7 +428,7 @@ do_images (GtkWidget *do_widget)
 
       /* Sensitivity control */
       button = gtk_toggle_button_new_with_mnemonic ("_Insensitive");
-      gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE);
 
       g_signal_connect (button, "toggled",
                         G_CALLBACK (toggle_sensitivity_callback),
diff --git a/demos/gtk-demo/infobar.c b/demos/gtk-demo/infobar.c
index bca0e31152..62df74f27a 100644
--- a/demos/gtk-demo/infobar.c
+++ b/demos/gtk-demo/infobar.c
@@ -65,24 +65,24 @@ do_infobar (GtkWidget *do_widget)
       gtk_container_add (GTK_CONTAINER (window), vbox);
 
       bar = gtk_info_bar_new ();
-      gtk_box_pack_start (GTK_BOX (vbox), bar, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), bar, FALSE, FALSE);
       gtk_info_bar_set_message_type (GTK_INFO_BAR (bar), GTK_MESSAGE_INFO);
       label = gtk_label_new ("This is an info bar with message type GTK_MESSAGE_INFO");
       gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
       gtk_label_set_xalign (GTK_LABEL (label), 0);
-      gtk_box_pack_start (GTK_BOX (gtk_info_bar_get_content_area (GTK_INFO_BAR (bar))), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (gtk_info_bar_get_content_area (GTK_INFO_BAR (bar))), label, FALSE, FALSE);
 
       button = gtk_toggle_button_new_with_label ("Message");
       g_object_bind_property (button, "active", bar, "visible", G_BINDING_BIDIRECTIONAL);
       gtk_container_add (GTK_CONTAINER (actions), button);
 
       bar = gtk_info_bar_new ();
-      gtk_box_pack_start (GTK_BOX (vbox), bar, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), bar, FALSE, FALSE);
       gtk_info_bar_set_message_type (GTK_INFO_BAR (bar), GTK_MESSAGE_WARNING);
       label = gtk_label_new ("This is an info bar with message type GTK_MESSAGE_WARNING");
       gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
       gtk_label_set_xalign (GTK_LABEL (label), 0);
-      gtk_box_pack_start (GTK_BOX (gtk_info_bar_get_content_area (GTK_INFO_BAR (bar))), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (gtk_info_bar_get_content_area (GTK_INFO_BAR (bar))), label, FALSE, FALSE);
 
       button = gtk_toggle_button_new_with_label ("Warning");
       g_object_bind_property (button, "active", bar, "visible", G_BINDING_BIDIRECTIONAL);
@@ -91,43 +91,45 @@ do_infobar (GtkWidget *do_widget)
       bar = gtk_info_bar_new_with_buttons (_("_OK"), GTK_RESPONSE_OK, NULL);
       gtk_info_bar_set_show_close_button (GTK_INFO_BAR (bar), TRUE);
       g_signal_connect (bar, "response", G_CALLBACK (on_bar_response), window);
-      gtk_box_pack_start (GTK_BOX (vbox), bar, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), bar, FALSE, FALSE);
       gtk_info_bar_set_message_type (GTK_INFO_BAR (bar), GTK_MESSAGE_QUESTION);
       label = gtk_label_new ("This is an info bar with message type GTK_MESSAGE_QUESTION");
       gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
       gtk_label_set_xalign (GTK_LABEL (label), 0);
-      gtk_box_pack_start (GTK_BOX (gtk_info_bar_get_content_area (GTK_INFO_BAR (bar))), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (gtk_info_bar_get_content_area (GTK_INFO_BAR (bar))), label, FALSE, FALSE);
 
       button = gtk_toggle_button_new_with_label ("Question");
       g_object_bind_property (button, "active", bar, "visible", G_BINDING_BIDIRECTIONAL);
       gtk_container_add (GTK_CONTAINER (actions), button);
 
       bar = gtk_info_bar_new ();
-      gtk_box_pack_start (GTK_BOX (vbox), bar, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), bar, FALSE, FALSE);
       gtk_info_bar_set_message_type (GTK_INFO_BAR (bar), GTK_MESSAGE_ERROR);
       label = gtk_label_new ("This is an info bar with message type GTK_MESSAGE_ERROR");
       gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
       gtk_label_set_xalign (GTK_LABEL (label), 0);
-      gtk_box_pack_start (GTK_BOX (gtk_info_bar_get_content_area (GTK_INFO_BAR (bar))), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (gtk_info_bar_get_content_area (GTK_INFO_BAR (bar))), label, FALSE, FALSE);
 
       button = gtk_toggle_button_new_with_label ("Error");
       g_object_bind_property (button, "active", bar, "visible", G_BINDING_BIDIRECTIONAL);
       gtk_container_add (GTK_CONTAINER (actions), button);
 
       bar = gtk_info_bar_new ();
-      gtk_box_pack_start (GTK_BOX (vbox), bar, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), bar, FALSE, FALSE);
       gtk_info_bar_set_message_type (GTK_INFO_BAR (bar), GTK_MESSAGE_OTHER);
       label = gtk_label_new ("This is an info bar with message type GTK_MESSAGE_OTHER");
       gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
       gtk_label_set_xalign (GTK_LABEL (label), 0);
-      gtk_box_pack_start (GTK_BOX (gtk_info_bar_get_content_area (GTK_INFO_BAR (bar))), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (gtk_info_bar_get_content_area (GTK_INFO_BAR (bar))), label, FALSE, FALSE);
 
       button = gtk_toggle_button_new_with_label ("Other");
       g_object_bind_property (button, "active", bar, "visible", G_BINDING_BIDIRECTIONAL);
       gtk_container_add (GTK_CONTAINER (actions), button);
 
       frame = gtk_frame_new ("Info bars");
-      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 8);
+      gtk_widget_set_margin_top (frame, 8);
+      gtk_widget_set_margin_bottom (frame, 8);
+      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE);
 
       vbox2 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 8);
       gtk_container_set_border_width (GTK_CONTAINER (vbox2), 8);
@@ -135,10 +137,10 @@ do_infobar (GtkWidget *do_widget)
 
       /* Standard message dialog */
       label = gtk_label_new ("An example of different info bars");
-      gtk_box_pack_start (GTK_BOX (vbox2), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox2), label, FALSE, FALSE);
 
       gtk_widget_show_all (actions);
-      gtk_box_pack_start (GTK_BOX (vbox2), actions, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox2), actions, FALSE, FALSE);
     }
 
   if (!gtk_widget_get_visible (window))
diff --git a/demos/gtk-demo/list_store.c b/demos/gtk-demo/list_store.c
index 6a77071f66..db065edb44 100644
--- a/demos/gtk-demo/list_store.c
+++ b/demos/gtk-demo/list_store.c
@@ -268,7 +268,7 @@ do_list_store (GtkWidget *do_widget)
       gtk_container_add (GTK_CONTAINER (window), vbox);
 
       label = gtk_label_new ("This is the bug list (note: not based on real data, it would be nice to have a nice ODBC interface to bugzilla or so, though).");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       sw = gtk_scrolled_window_new (NULL, NULL);
       gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (sw),
@@ -276,7 +276,7 @@ do_list_store (GtkWidget *do_widget)
       gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
                                       GTK_POLICY_NEVER,
                                       GTK_POLICY_AUTOMATIC);
-      gtk_box_pack_start (GTK_BOX (vbox), sw, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), sw, TRUE, TRUE);
 
       /* create tree model */
       model = create_model ();
diff --git a/demos/gtk-demo/listbox.c b/demos/gtk-demo/listbox.c
index 1bd3ee0803..798be03e95 100644
--- a/demos/gtk-demo/listbox.c
+++ b/demos/gtk-demo/listbox.c
@@ -359,10 +359,10 @@ do_listbox (GtkWidget *do_widget)
       vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
       gtk_container_add (GTK_CONTAINER (window), vbox);
       label = gtk_label_new ("Messages from Gtk+ and friends");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
       scrolled = gtk_scrolled_window_new (NULL, NULL);
       gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled), GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
-      gtk_box_pack_start (GTK_BOX (vbox), scrolled, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), scrolled, TRUE, TRUE);
       listbox = gtk_list_box_new ();
       gtk_container_add (GTK_CONTAINER (scrolled), listbox);
 
diff --git a/demos/gtk-demo/menus.c b/demos/gtk-demo/menus.c
index 86c435e86a..5537751e87 100644
--- a/demos/gtk-demo/menus.c
+++ b/demos/gtk-demo/menus.c
@@ -117,7 +117,7 @@ do_menus (GtkWidget *do_widget)
 
       menubar = gtk_menu_bar_new ();
       gtk_widget_set_hexpand (menubar, TRUE);
-      gtk_box_pack_start (GTK_BOX (box1), menubar, FALSE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (box1), menubar, FALSE, TRUE);
       gtk_widget_show (menubar);
 
       menu = create_menu (2);
@@ -139,19 +139,19 @@ do_menus (GtkWidget *do_widget)
 
       box2 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 10);
       gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
-      gtk_box_pack_start (GTK_BOX (box1), box2, FALSE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (box1), box2, FALSE, TRUE);
       gtk_widget_show (box2);
 
       button = gtk_button_new_with_label ("Flip");
       g_signal_connect (button, "clicked",
                         G_CALLBACK (change_orientation), menubar);
-      gtk_box_pack_start (GTK_BOX (box2), button, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (box2), button, TRUE, TRUE);
       gtk_widget_show (button);
 
       button = gtk_button_new_with_label ("Close");
       g_signal_connect_swapped (button, "clicked",
                                 G_CALLBACK(gtk_widget_destroy), window);
-      gtk_box_pack_start (GTK_BOX (box2), button, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (box2), button, TRUE, TRUE);
       gtk_widget_set_can_default (button, TRUE);
       gtk_widget_grab_default (button);
       gtk_widget_show (button);
diff --git a/demos/gtk-demo/offscreen_window.c b/demos/gtk-demo/offscreen_window.c
index 20f0b6c4f3..ce5a077339 100644
--- a/demos/gtk-demo/offscreen_window.c
+++ b/demos/gtk-demo/offscreen_window.c
@@ -590,8 +590,8 @@ do_offscreen_window (GtkWidget *do_widget)
       g_signal_connect (scale, "value-changed", G_CALLBACK (scale_changed), bin);
 
       gtk_container_add (GTK_CONTAINER (window), vbox);
-      gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
-      gtk_box_pack_start (GTK_BOX (vbox), bin, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE);
+      gtk_box_pack_start (GTK_BOX (vbox), bin, TRUE, TRUE);
       gtk_container_add (GTK_CONTAINER (bin), button);
     }
 
diff --git a/demos/gtk-demo/offscreen_window2.c b/demos/gtk-demo/offscreen_window2.c
index 9d96500613..ce91040ee7 100644
--- a/demos/gtk-demo/offscreen_window2.c
+++ b/demos/gtk-demo/offscreen_window2.c
@@ -501,11 +501,11 @@ do_offscreen_window2 (GtkWidget *do_widget)
       gtk_size_group_add_widget (group, applybutton);
 
       gtk_container_add (GTK_CONTAINER (window), vbox);
-      gtk_box_pack_start (GTK_BOX (vbox), bin, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), bin, TRUE, TRUE);
       gtk_container_add (GTK_CONTAINER (bin), hbox);
-      gtk_box_pack_start (GTK_BOX (hbox), backbutton, FALSE, FALSE, 0);
-      gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE, 0);
-      gtk_box_pack_start (GTK_BOX (hbox), applybutton, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), backbutton, FALSE, FALSE);
+      gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE);
+      gtk_box_pack_start (GTK_BOX (hbox), applybutton, FALSE, FALSE);
     }
 
   if (!gtk_widget_get_visible (window))
diff --git a/demos/gtk-demo/overlay.c b/demos/gtk-demo/overlay.c
index 5861e11290..4f64347124 100644
--- a/demos/gtk-demo/overlay.c
+++ b/demos/gtk-demo/overlay.c
@@ -63,10 +63,14 @@ do_overlay (GtkWidget *do_widget)
 
       label = gtk_label_new ("<span foreground='blue' weight='ultrabold' font='40'>Numbers</span>");
       gtk_label_set_use_markup (GTK_LABEL (label), TRUE);
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 8);
+      gtk_widget_set_margin_top (label, 8);
+      gtk_widget_set_margin_bottom (label, 8);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       gtk_entry_set_placeholder_text (GTK_ENTRY (entry), "Your Lucky Number");
-      gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 8);
+      gtk_widget_set_margin_top (entry, 8);
+      gtk_widget_set_margin_bottom (entry, 8);
+      gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE);
 
       gtk_container_add (GTK_CONTAINER (window), overlay);
 
diff --git a/demos/gtk-demo/panes.c b/demos/gtk-demo/panes.c
index 98cf8bc47b..e92a37c3c4 100644
--- a/demos/gtk-demo/panes.c
+++ b/demos/gtk-demo/panes.c
@@ -148,7 +148,7 @@ do_panes (GtkWidget *do_widget)
       gtk_container_add (GTK_CONTAINER (window), vbox);
 
       vpaned = gtk_paned_new (GTK_ORIENTATION_VERTICAL);
-      gtk_box_pack_start (GTK_BOX (vbox), vpaned, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), vpaned, TRUE, TRUE);
       gtk_container_set_border_width (GTK_CONTAINER(vpaned), 5);
 
       hpaned = gtk_paned_new (GTK_ORIENTATION_HORIZONTAL);
@@ -179,14 +179,14 @@ do_panes (GtkWidget *do_widget)
                                                "Horizontal",
                                                "Left",
                                                "Right"),
-                          FALSE, FALSE, 0);
+                          FALSE, FALSE);
 
       gtk_box_pack_start (GTK_BOX (vbox),
                           create_pane_options (GTK_PANED (vpaned),
                                                "Vertical",
                                                "Top",
                                                "Bottom"),
-                          FALSE, FALSE, 0);
+                          FALSE, FALSE);
 
       gtk_widget_show_all (vbox);
     }
diff --git a/demos/gtk-demo/search_entry.c b/demos/gtk-demo/search_entry.c
index 63df73cb00..37cb10a51b 100644
--- a/demos/gtk-demo/search_entry.c
+++ b/demos/gtk-demo/search_entry.c
@@ -243,21 +243,21 @@ do_search_entry (GtkWidget *do_widget)
 
       label = gtk_label_new (NULL);
       gtk_label_set_markup (GTK_LABEL (label), "Search entry demo");
-      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE);
 
       hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
-      gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE);
       gtk_container_set_border_width (GTK_CONTAINER (hbox), 0);
 
       /* Create our entry */
       entry = gtk_search_entry_new ();
-      gtk_box_pack_start (GTK_BOX (hbox), entry, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), entry, FALSE, FALSE);
 
       /* Create the find and cancel buttons */
       notebook = gtk_notebook_new ();
       gtk_notebook_set_show_tabs (GTK_NOTEBOOK (notebook), FALSE);
       gtk_notebook_set_show_border (GTK_NOTEBOOK (notebook), FALSE);
-      gtk_box_pack_start (GTK_BOX (hbox), notebook, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), notebook, FALSE, FALSE);
 
       find_button = gtk_button_new_with_label ("Find");
       g_signal_connect (find_button, "clicked",
diff --git a/demos/gtk-demo/search_entry2.c b/demos/gtk-demo/search_entry2.c
index b20cb13dea..be70e51756 100644
--- a/demos/gtk-demo/search_entry2.c
+++ b/demos/gtk-demo/search_entry2.c
@@ -92,12 +92,12 @@ do_search_entry2 (GtkWidget *do_widget)
       entry = gtk_search_entry_new ();
       container = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
       gtk_widget_set_halign (container, GTK_ALIGN_CENTER);
-      gtk_box_pack_start (GTK_BOX (container), entry, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (container), entry, FALSE, FALSE);
       searchbar = gtk_search_bar_new ();
       gtk_search_bar_connect_entry (GTK_SEARCH_BAR (searchbar), GTK_ENTRY (entry));
       gtk_search_bar_set_show_close_button (GTK_SEARCH_BAR (searchbar), FALSE);
       gtk_container_add (GTK_CONTAINER (searchbar), container);
-      gtk_box_pack_start (GTK_BOX (vbox), searchbar, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), searchbar, FALSE, FALSE);
 
       /* Hook the search bar to key presses */
       g_signal_connect (window, "key-press-event",
@@ -105,27 +105,27 @@ do_search_entry2 (GtkWidget *do_widget)
 
       /* Help */
       label = gtk_label_new ("Start Typing to search");
-      gtk_box_pack_start (GTK_BOX (vbox), label, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), label, TRUE, TRUE);
 
       /* Toggle button */
       button = gtk_toggle_button_new_with_label ("Search");
       g_object_bind_property (button, "active",
                               searchbar, "search-mode-enabled",
                               G_BINDING_BIDIRECTIONAL);
-      gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE);
 
       /* Result */
       hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
-      gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE);
       gtk_container_set_border_width (GTK_CONTAINER (hbox), 0);
 
       label = gtk_label_new ("Result:");
       gtk_label_set_xalign (GTK_LABEL (label), 0.0);
       gtk_widget_set_margin_start (label, 6);
-      gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE);
 
       label = gtk_label_new ("");
-      gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE);
 
       g_signal_connect (entry, "search-changed",
                         G_CALLBACK (search_changed_cb), label);
@@ -133,16 +133,16 @@ do_search_entry2 (GtkWidget *do_widget)
                         G_CALLBACK (changed_cb), label);
 
       hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
-      gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE);
       gtk_container_set_border_width (GTK_CONTAINER (hbox), 0);
 
       label = gtk_label_new ("Signal:");
       gtk_label_set_xalign (GTK_LABEL (label), 0.0);
       gtk_widget_set_margin_start (label, 6);
-      gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE);
 
       label = gtk_label_new ("");
-      gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE);
 
       g_signal_connect (entry, "search-changed",
                         G_CALLBACK (search_changed), label);
diff --git a/demos/gtk-demo/sidebar.c b/demos/gtk-demo/sidebar.c
index 6830accfb6..b7061adf38 100644
--- a/demos/gtk-demo/sidebar.c
+++ b/demos/gtk-demo/sidebar.c
@@ -49,7 +49,7 @@ do_sidebar (GtkWidget *do_widget)
 
       box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
       sidebar = gtk_stack_sidebar_new ();
-      gtk_box_pack_start (GTK_BOX (box), sidebar, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (box), sidebar, FALSE, FALSE);
 
       stack = gtk_stack_new ();
       gtk_stack_set_transition_type (GTK_STACK (stack), GTK_STACK_TRANSITION_TYPE_SLIDE_UP_DOWN);
@@ -57,9 +57,9 @@ do_sidebar (GtkWidget *do_widget)
 
       /* Separator between sidebar and stack */
       widget = gtk_separator_new (GTK_ORIENTATION_VERTICAL);
-      gtk_box_pack_start (GTK_BOX(box), widget, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX(box), widget, FALSE, FALSE);
 
-      gtk_box_pack_start (GTK_BOX (box), stack, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (box), stack, TRUE, TRUE);
 
       for (i=0; (c = *(pages+i)) != NULL; i++ )
         {
diff --git a/demos/gtk-demo/sizegroup.c b/demos/gtk-demo/sizegroup.c
index 1a639244a7..e196f254f6 100644
--- a/demos/gtk-demo/sizegroup.c
+++ b/demos/gtk-demo/sizegroup.c
@@ -116,7 +116,7 @@ do_sizegroup (GtkWidget *do_widget)
 
       /* Create one frame holding color options */
       frame = gtk_frame_new ("Color Options");
-      gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE);
 
       table = gtk_grid_new ();
       gtk_container_set_border_width (GTK_CONTAINER (table), 5);
@@ -129,7 +129,7 @@ do_sizegroup (GtkWidget *do_widget)
 
       /* And another frame holding line style options */
       frame = gtk_frame_new ("Line Options");
-      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE);
 
       table = gtk_grid_new ();
       gtk_container_set_border_width (GTK_CONTAINER (table), 5);
@@ -142,7 +142,7 @@ do_sizegroup (GtkWidget *do_widget)
 
       /* And a check button to turn grouping on and off */
       check_button = gtk_check_button_new_with_mnemonic ("_Enable grouping");
-      gtk_box_pack_start (GTK_BOX (vbox), check_button, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), check_button, FALSE, FALSE);
 
       gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check_button), TRUE);
       g_signal_connect (check_button, "toggled",
diff --git a/demos/gtk-demo/spinner.c b/demos/gtk-demo/spinner.c
index c368c20fbb..969665f655 100644
--- a/demos/gtk-demo/spinner.c
+++ b/demos/gtk-demo/spinner.c
@@ -52,7 +52,7 @@ do_spinner (GtkWidget *do_widget)
     content_area = gtk_dialog_get_content_area (GTK_DIALOG (window));
 
     vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
-    gtk_box_pack_start (GTK_BOX (content_area), vbox, TRUE, TRUE, 0);
+    gtk_box_pack_start (GTK_BOX (content_area), vbox, TRUE, TRUE);
     gtk_container_set_border_width (GTK_CONTAINER (vbox), 5);
 
     /* Sensitive */
diff --git a/demos/gtk-demo/textscroll.c b/demos/gtk-demo/textscroll.c
index 3c14605554..1931e69ace 100644
--- a/demos/gtk-demo/textscroll.c
+++ b/demos/gtk-demo/textscroll.c
@@ -157,7 +157,7 @@ create_text_view (GtkWidget *hbox,
   guint timeout;
 
   swindow = gtk_scrolled_window_new (NULL, NULL);
-  gtk_box_pack_start (GTK_BOX (hbox), swindow, TRUE, TRUE, 0);
+  gtk_box_pack_start (GTK_BOX (hbox), swindow, TRUE, TRUE);
   textview = gtk_text_view_new ();
   gtk_container_add (GTK_CONTAINER (swindow), textview);
 
diff --git a/demos/gtk-demo/toolpalette.c b/demos/gtk-demo/toolpalette.c
index 8470eb8b29..2d61e7ee1d 100644
--- a/demos/gtk-demo/toolpalette.c
+++ b/demos/gtk-demo/toolpalette.c
@@ -473,7 +473,7 @@ do_toolpalette (GtkWidget *do_widget)
                                       "text", 0,
                                       NULL);
       gtk_combo_box_set_active_iter (GTK_COMBO_BOX (combo_orientation), &iter);
-      gtk_box_pack_start (GTK_BOX (box), combo_orientation, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (box), combo_orientation, FALSE, FALSE);
 
       /* Style combo box: */
       style_model = gtk_list_store_new (2, G_TYPE_STRING, G_TYPE_INT);
@@ -512,11 +512,11 @@ do_toolpalette (GtkWidget *do_widget)
                                       "text", 0,
                                       NULL);
       gtk_combo_box_set_active_iter (GTK_COMBO_BOX (combo_style), &iter);
-      gtk_box_pack_start (GTK_BOX (box), combo_style, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (box), combo_style, FALSE, FALSE);
 
       /* Add hbox */
       hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 5);
-      gtk_box_pack_start (GTK_BOX (box), hbox, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (box), hbox, TRUE, TRUE);
 
       /* Add and fill the ToolPalette: */
       palette = gtk_tool_palette_new ();
@@ -550,7 +550,7 @@ do_toolpalette (GtkWidget *do_widget)
 
       notebook = gtk_notebook_new ();
       gtk_container_set_border_width (GTK_CONTAINER (notebook), 6);
-      gtk_box_pack_end (GTK_BOX(hbox), notebook, FALSE, FALSE, 0);
+      gtk_box_pack_end (GTK_BOX(hbox), notebook, FALSE, FALSE);
 
       /* ===== DnD for tool items ===== */
 
diff --git a/demos/gtk-demo/tree_store.c b/demos/gtk-demo/tree_store.c
index a327af0071..318b4dba17 100644
--- a/demos/gtk-demo/tree_store.c
+++ b/demos/gtk-demo/tree_store.c
@@ -403,7 +403,7 @@ do_tree_store (GtkWidget *do_widget)
 
       gtk_box_pack_start (GTK_BOX (vbox),
                           gtk_label_new ("Jonathan's Holiday Card Planning Sheet"),
-                          FALSE, FALSE, 0);
+                          FALSE, FALSE);
 
       sw = gtk_scrolled_window_new (NULL, NULL);
       gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (sw),
@@ -411,7 +411,7 @@ do_tree_store (GtkWidget *do_widget)
       gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
                                       GTK_POLICY_AUTOMATIC,
                                       GTK_POLICY_AUTOMATIC);
-      gtk_box_pack_start (GTK_BOX (vbox), sw, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (vbox), sw, TRUE, TRUE);
 
       /* create model */
       model = create_model ();
diff --git a/demos/widget-factory/widget-factory.c b/demos/widget-factory/widget-factory.c
index 1584c134eb..d972f32008 100644
--- a/demos/widget-factory/widget-factory.c
+++ b/demos/widget-factory/widget-factory.c
@@ -787,7 +787,7 @@ overshot (GtkScrolledWindow *sw, GtkPositionType pos, GtkWidget *widget)
                 "margin", 6,
                 "xalign", 0.0,
                 NULL);
-  gtk_box_pack_start (GTK_BOX (row), label, TRUE, TRUE, 0);
+  gtk_box_pack_start (GTK_BOX (row), label, TRUE, TRUE);
   gdk_rgba_parse (&rgba, color);
   swatch = g_object_new (g_type_from_name ("GtkColorSwatch"),
                          "rgba", &rgba,
@@ -799,7 +799,7 @@ overshot (GtkScrolledWindow *sw, GtkPositionType pos, GtkWidget *widget)
                          NULL);
   box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
   gtk_container_add (GTK_CONTAINER (box), swatch);
-  gtk_box_pack_start (GTK_BOX (row), box, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (row), box, FALSE, FALSE);
   gtk_widget_show_all (row);
   gtk_list_box_insert (GTK_LIST_BOX (widget), row, -1);
   row = gtk_widget_get_parent (row);
@@ -898,7 +898,7 @@ populate_colors (GtkWidget *widget, GtkWidget *chooser)
                     "margin", 6,
                     "xalign", 0.0,
                     NULL);
-      gtk_box_pack_start (GTK_BOX (row), label, TRUE, TRUE, 0);
+      gtk_box_pack_start (GTK_BOX (row), label, TRUE, TRUE);
       gdk_rgba_parse (&rgba, colors[i].color);
       swatch = g_object_new (g_type_from_name ("GtkColorSwatch"),
                              "rgba", &rgba,
@@ -910,7 +910,7 @@ populate_colors (GtkWidget *widget, GtkWidget *chooser)
                              NULL);
       box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
       gtk_container_add (GTK_CONTAINER (box), swatch);
-      gtk_box_pack_start (GTK_BOX (row), box, FALSE, FALSE, 0);
+      gtk_box_pack_start (GTK_BOX (row), box, FALSE, FALSE);
       gtk_widget_show_all (row);
       gtk_list_box_insert (GTK_LIST_BOX (widget), row, -1);
       row = gtk_widget_get_parent (row);