[gtk+/gtk-3-22] Revert "Widget: Remove obsolete hack-arounds for HandleBox"

[Daniel Boles <dboles src gnome org>]

commit 4ce5bed724b4c7afd2d9dcd6acf4647405a33448
Author: Daniel Boles <dboles src gmail com>
Date:   Mon Aug 7 19:38:12 2017 +0100

    Revert "Widget: Remove obsolete hack-arounds for HandleBox"
    
    This reverts commit 12805a4fbfa66b10efbe48c03595b0d5b7608d0e.
    
    I must have been looking at the wrong tree because HandleBox is only
    deprecated in GTK+ 3, not removed.

 gtk/gtkwidget.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 56b6ce0..ced572d 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -6321,6 +6321,9 @@ gtk_widget_translate_coordinates (GtkWidget  *src_widget,
       src_y = dy;
 
       window = gdk_window_get_effective_parent (window);
+
+      if (!window)             /* Handle GtkHandleBox */
+       return FALSE;
     }
 
   /* And back */
@@ -6330,6 +6333,12 @@ gtk_widget_translate_coordinates (GtkWidget  *src_widget,
       dest_list = g_list_prepend (dest_list, window);
 
       window = gdk_window_get_effective_parent (window);
+
+      if (!window)             /* Handle GtkHandleBox */
+        {
+          g_list_free (dest_list);
+          return FALSE;
+        }
     }
 
   while (dest_list)