[gimp] app: don't let gtk_tree_store_clear() mess with our selected item

[Michael Natterer <mitch src gnome org>]

commit 3f954350d90ebb2c20204ea229bbcfe11704f17c
Author: Michael Natterer <mitch gimp org>
Date:   Sun Jun 3 21:45:16 2018 +0200

    app: don't let gtk_tree_store_clear() mess with our selected item
    
    gimp_container_tree_view_clear_items(): GTK+ 3.x always keeps the row
    with the cursor selected, so we get a gazillion selection changed
    during gtk_tree_store_clear(), block our selection changed handler
    during the clear.

 app/widgets/gimpcontainertreeview.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/app/widgets/gimpcontainertreeview.c b/app/widgets/gimpcontainertreeview.c
index 835cce4a36..610972e5f6 100644
--- a/app/widgets/gimpcontainertreeview.c
+++ b/app/widgets/gimpcontainertreeview.c
@@ -922,8 +922,19 @@ gimp_container_tree_view_clear_items (GimpContainerView *view)
 {
   GimpContainerTreeView *tree_view = GIMP_CONTAINER_TREE_VIEW (view);
 
+  /* GTK+ 3.x always keeps the row with the cursor selected, so we get
+   * a gazillion selection changed during gtk_tree_store_clear()
+   */
+  g_signal_handlers_block_by_func (tree_view->priv->selection,
+                                   gimp_container_tree_view_selection_changed,
+                                   tree_view);
+
   gimp_container_tree_store_clear_items (GIMP_CONTAINER_TREE_STORE (tree_view->model));
 
+  g_signal_handlers_unblock_by_func (tree_view->priv->selection,
+                                     gimp_container_tree_view_selection_changed,
+                                     tree_view);
+
   parent_view_iface->clear_items (view);
 }