[gtk/gtk-3-24: 3/5] menu: Force recalculation of size before positioning

[Matthias Clasen <matthiasc src gnome org>]

commit 7298e73c445dc06e9840c47667501e1cb5dd5a71
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Feb 7 09:55:51 2019 +0100

    menu: Force recalculation of size before positioning
    
    On X11, the position of the menu is calculated synchronously by
    gdk_window_move_to_rect(). This means that calculating the window size
    when showing is too late, as that'd mean the size used when calculating
    the position is out-of-date. The first time a menu is mapped, however,
    the size is calculated during realization; but a window is only realized
    once, so it doesn't work for subsequent maps.
    
    Currently, this is harmless, as a GtkMenu can change its size however it
    wants after it has been mapped. This, however, is problematic, as it
    means the position calculated by gdk_window_move_to_rect() might no
    longer be valid, or constraints made by the same function might no
    longer be respected.
    
    Thus, this is a preparation for making GtkMenu popups stay the same size
    until they are remapped again at a later point.

 gtk/gtkmenu.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/gtkmenu.c b/gtk/gtkmenu.c
index 7b156f9861..3a9c69ae6d 100644
--- a/gtk/gtkmenu.c
+++ b/gtk/gtkmenu.c
@@ -5267,6 +5267,7 @@ gtk_menu_position (GtkMenu  *menu,
    * the right place to popup the menu.
    */
   gtk_widget_realize (priv->toplevel);
+  gtk_window_move_resize (GTK_WINDOW (priv->toplevel));
 
   if (!gtk_widget_get_visible (priv->toplevel))
     gtk_window_set_type_hint (GTK_WINDOW (priv->toplevel), priv->menu_type_hint);