x11/surface: Remember when there is a pending ConfigureNotify

This will be used to decide whether to try to resize windows when .

gdk/x11/gdkdisplay-x11.c

@@ -964,6 +964,7 @@ gdk_x11_display_translate_event (GdkEventTranslator *translator,
               surface_impl->next_layout.configured_width = configured_width;
               surface_impl->next_layout.configured_height = configured_height;
               surface_impl->next_layout.surface_geometry_dirty = TRUE;
+              surface_impl->next_layout.configure_pending = TRUE;
               gdk_surface_request_layout (surface);
             }
 

gdk/x11/gdksurface-x11.c

@@ -341,6 +341,7 @@ gdk_x11_surface_compute_size (GdkSurface *surface)
       _gdk_x11_surface_update_size (impl);
 
       impl->next_layout.surface_geometry_dirty = FALSE;
+      impl->next_layout.configure_pending = FALSE;
     }
   else
     {

gdk/x11/gdksurface-x11.h

@@ -75,6 +75,7 @@ struct _GdkX11Surface
   struct {
     int configured_width;
     int configured_height;
+    gboolean configure_pending;
     gboolean surface_geometry_dirty;
   } next_layout;