list-view: Get proper backing-uri for tree expanders

When using tree expanders, we have special cases for the backing uri.
In GridView or ColumnView (without expanders), the backing uri is
always the current view directory.  With tree expanders, the backing
uri is either the parent of the currently selected item, or the
currently selected item (if it is an expanded directory).  The same
rules apply for multiple selection if there is a common parent.

This was the case in 42, and the code was dropped in
6708861ed174e2b2423df0500df9987cdaf2adc0, and as an oversight wasn't added
back in when tree expanders were reintroduced.

Fixes: https://gitlab.gnome.org/GNOME/nautilus/-/issues/2888

1 files changed, 55 insertions, 0 deletions

diff --git a/src/nautilus-list-view.c b/src/nautilus-list-view.c
index 92fe42250..b37ddbfb2 100644
--- a/src/nautilus-list-view.c
+++ b/src/nautilus-list-view.c
@@ -853,6 +853,60 @@ real_sort_directories_first_changed (NautilusFilesView *files_view)
     nautilus_view_model_sort (nautilus_list_base_get_model (NAUTILUS_LIST_BASE (self)));
 }
 
+static char *
+real_get_backing_uri (NautilusFilesView *view)
+{
+    NautilusListView *self = NAUTILUS_LIST_VIEW (view);
+    NautilusViewModel *model = nautilus_list_base_get_model (NAUTILUS_LIST_BASE (self));
+    g_autoptr (NautilusFile) common_parent = NULL;
+
+    if (!self->expand_as_a_tree)
+    {
+        return NAUTILUS_FILES_VIEW_CLASS (nautilus_list_view_parent_class)->get_backing_uri (view);
+    }
+
+    /* If we are using tree expanders use the items parent, unless it
+     * is an expanded folder, in which case we should use that folder directly.
+     * When dealing with multiple selections, use the same rules, but only
+     * if a common parent exists. */
+
+    for (guint i = 0; i < g_list_model_get_n_items (G_LIST_MODEL (model)); i++)
+    {
+        g_autoptr (GtkTreeListRow) row = g_list_model_get_item (G_LIST_MODEL (model), i);
+        g_autoptr (NautilusViewItem) item = NULL;
+        g_autoptr (NautilusFile) parent_file = NULL;
+        NautilusFile *file;
+        NautilusFile *current_parent;
+
+        if (!gtk_selection_model_is_selected (GTK_SELECTION_MODEL (model), i))
+        {
+            continue;
+        }
+
+        item = gtk_tree_list_row_get_item (row);
+        file = nautilus_view_item_get_file (item);
+        parent_file = nautilus_file_get_parent (file);
+        current_parent = gtk_tree_list_row_get_expanded (row) ? file : parent_file;
+
+        if (common_parent == NULL)
+        {
+            common_parent = nautilus_file_ref (current_parent);
+        }
+        else if (current_parent != common_parent)
+        {
+            g_clear_pointer (&common_parent, nautilus_file_unref);
+            break;
+        }
+    }
+
+    if (common_parent != NULL)
+    {
+        return nautilus_file_get_uri (common_parent);
+    }
+
+    return NAUTILUS_FILES_VIEW_CLASS (nautilus_list_view_parent_class)->get_backing_uri (view);
+}
+
 static guint
 real_get_view_id (NautilusFilesView *files_view)
 {
@@ -1485,6 +1539,7 @@ nautilus_list_view_class_init (NautilusListViewClass *klass)
     files_view_class->can_zoom_in = real_can_zoom_in;
     files_view_class->can_zoom_out = real_can_zoom_out;
     files_view_class->sort_directories_first_changed = real_sort_directories_first_changed;
+    files_view_class->get_backing_uri = real_get_backing_uri;
     files_view_class->get_view_id = real_get_view_id;
     files_view_class->restore_standard_zoom_level = real_restore_standard_zoom_level;
     files_view_class->is_zoom_level_default = real_is_zoom_level_default;