notebook: Translate coordinates to find clicked tab

In GTK3, the tab label allocation was given in coordinates which were
relative to the parent widget's allocation.

In GTK4 the allocation is for the widget's own coordinates instead.

Translate the event coordinates accordingly to make this logic work
again. Also, test for the lower limit in addition to the upper limit.

1 files changed, 5 insertions, 5 deletions

diff --git a/src/nautilus-notebook.c b/src/nautilus-notebook.c
index 96a8ca97b..5767d22a9 100644
--- a/src/nautilus-notebook.c
+++ b/src/nautilus-notebook.c
@@ -49,7 +49,7 @@ find_tab_num_at_pos (GtkNotebook *notebook,
     while ((page = gtk_notebook_get_nth_page (notebook, page_num)))
     {
         GtkWidget *tab;
-        gint max_x, max_y;
+        gdouble tab_x, tab_y;
 
         tab = gtk_notebook_get_tab_label (notebook, page);
         g_return_val_if_fail (tab != NULL, -1);
@@ -61,11 +61,11 @@ find_tab_num_at_pos (GtkNotebook *notebook,
         }
 
         gtk_widget_get_allocation (tab, &allocation);
+        gtk_widget_translate_coordinates (GTK_WIDGET (notebook), tab,
+                                          abs_x, abs_y, &tab_x, &tab_y);
 
-        max_x = allocation.x + allocation.width;
-        max_y = allocation.y + allocation.height;
-
-        if (abs_x <= max_x && abs_y <= max_y)
+        if (tab_x >= allocation.x && tab_x <= allocation.x + allocation.width &&
+            tab_y >= allocation.y && tab_y <= allocation.y + allocation.height)
         {
             return page_num;
         }