[gtk: 1/2] x11/dnd: Ignore XErrors from the COW

[Matthias Clasen <matthiasc src gnome org>]

commit 80ba38a0b365f65104e481f17047bf5f343b0980
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Mon Mar 22 15:34:31 2021 +0100

    x11/dnd: Ignore XErrors from the COW
    
    The DnD code for X11 adds the composite overlay window (aka COW) to the
    cache.
    
    Yet the X11 requests to get and release the COW may trigger XErrors that
    we ought to ignore otherwise the client will abort.
    
    Fixes: #3715

 gdk/x11/gdkdrag-x11.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gdk/x11/gdkdrag-x11.c b/gdk/x11/gdkdrag-x11.c
index d8c9ac28b8..d82d3a7d4b 100644
--- a/gdk/x11/gdkdrag-x11.c
+++ b/gdk/x11/gdkdrag-x11.c
@@ -581,12 +581,14 @@ gdk_surface_cache_new (GdkDisplay *display)
    */
   if (gdk_display_is_composited (display))
     {
+      gdk_x11_display_error_trap_push (display);
       cow = XCompositeGetOverlayWindow (xdisplay, xroot_window);
       gdk_surface_cache_add (result, cow, 0, 0,
                            WidthOfScreen (GDK_X11_SCREEN (screen)->xscreen),
                            HeightOfScreen (GDK_X11_SCREEN (screen)->xscreen),
                            TRUE);
       XCompositeReleaseOverlayWindow (xdisplay, xroot_window);
+      gdk_x11_display_error_trap_pop_ignored (display);
     }
 #endif