From: Corey Berla <corey@berla.me>
Date: Wed, 30 Nov 2022 04:00:48 +0000 (-0800)
Subject: treeexpander: Scroll to expanded item
X-Git-Tag: archive/raspbian/4.12.3+ds-1+rpi1~1^2^2^2~22^2~9^2~58^2~1
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=fdfd76774e9e2e0b704f455026f63e93f42d3c04;p=gtk4.git

treeexpander: Scroll to expanded item

If the anchor is below the expanded item, the expanded item will
go out of view if there are sufficient children items.  This is not
ideal, so make sure to scroll to the item to ensure it remains in
view.
---

diff --git a/gtk/gtktreeexpander.c b/gtk/gtktreeexpander.c
index d2cce546a3..a89a51eb0b 100644
--- a/gtk/gtktreeexpander.c
+++ b/gtk/gtktreeexpander.c
@@ -503,11 +503,17 @@ gtk_tree_expander_toggle_expand (GtkWidget  *widget,
                                  GVariant   *parameter)
 {
   GtkTreeExpander *self = GTK_TREE_EXPANDER (widget);
+  gboolean expand;
 
   if (self->list_row == NULL)
     return;
 
-  gtk_tree_list_row_set_expanded (self->list_row, !gtk_tree_list_row_get_expanded (self->list_row));
+  expand = !gtk_tree_list_row_get_expanded (self->list_row);
+
+  if (expand)
+    gtk_widget_activate_action (widget, "listitem.scroll-to", NULL);
+
+  gtk_tree_list_row_set_expanded (self->list_row, expand);
 }
 
 static gboolean