[gtk+/gtk-3-22] Revert "wayland: Push NULL buffer when hiding a GdkWindow"

[Carlos Garnacho <carlosg src gnome org>]

commit bbcc3ee45643ccdc25bc525b4d7f7daf6b25440a
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Jan 19 20:07:14 2017 +0100

    Revert "wayland: Push NULL buffer when hiding a GdkWindow"
    
    This reverts commit 0f2e19c01059d151d606e7006d95dc7f60c222fc.

 gdk/wayland/gdkwindow-wayland.c |   11 ++++-------
 1 files changed, 4 insertions(+), 7 deletions(-)
---
diff --git a/gdk/wayland/gdkwindow-wayland.c b/gdk/wayland/gdkwindow-wayland.c
index 508930b..d629288 100644
--- a/gdk/wayland/gdkwindow-wayland.c
+++ b/gdk/wayland/gdkwindow-wayland.c
@@ -2454,7 +2454,7 @@ unmap_popups_for_window (GdkWindow *window)
 }
 
 static void
-gdk_wayland_window_clear_surface (GdkWindow *window)
+gdk_wayland_window_hide_surface (GdkWindow *window)
 {
   GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (gdk_window_get_display (window));
   GdkWindowImplWayland *impl = GDK_WINDOW_IMPL_WAYLAND (window->impl);
@@ -2549,10 +2549,7 @@ gdk_wayland_window_clear_surface (GdkWindow *window)
 static void
 gdk_wayland_window_hide (GdkWindow *window)
 {
-  GdkWindowImplWayland *impl = GDK_WINDOW_IMPL_WAYLAND (window->impl);
-
-  wl_surface_attach (impl->display_server.wl_surface, NULL, 0, 0);
-  wl_surface_commit (impl->display_server.wl_surface);
+  gdk_wayland_window_hide_surface (window);
   _gdk_window_clear_update_area (window);
 }
 
@@ -2566,7 +2563,7 @@ gdk_window_wayland_withdraw (GdkWindow *window)
 
       g_assert (!GDK_WINDOW_IS_MAPPED (window));
 
-      gdk_wayland_window_clear_surface (window);
+      gdk_wayland_window_hide_surface (window);
     }
 }
 
@@ -2874,7 +2871,7 @@ gdk_wayland_window_destroy (GdkWindow *window,
    */
   g_return_if_fail (!foreign_destroy);
 
-  gdk_wayland_window_clear_surface (window);
+  gdk_wayland_window_hide_surface (window);
   drop_cairo_surfaces (window);
 }