[mutter] window/wayland: Freeze updates until shown

[Florian Müllner <fmuellner src gnome org>]

commit 7d82cdeea307608c9f4e6442eb4ea64d7dee0c58
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Sep 14 19:06:55 2018 +0200

    window/wayland: Freeze updates until shown
    
    Not until the window is shown do we know what monitor it's on, thus the
    size, so freeze updates (shape etc) until the window is shown.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/229

 src/wayland/meta-window-wayland.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)
---
diff --git a/src/wayland/meta-window-wayland.c b/src/wayland/meta-window-wayland.c
index 46ee78095..c71cc9a0b 100644
--- a/src/wayland/meta-window-wayland.c
+++ b/src/wayland/meta-window-wayland.c
@@ -57,6 +57,8 @@ struct _MetaWindowWayland
   int last_sent_y;
   int last_sent_width;
   int last_sent_height;
+
+  gboolean has_been_shown;
 };
 
 struct _MetaWindowWaylandClass
@@ -538,6 +540,19 @@ appears_focused_changed (GObject    *object,
   surface_state_changed (window);
 }
 
+static void
+on_window_shown (MetaWindow *window)
+{
+  MetaWindowWayland *wl_window = META_WINDOW_WAYLAND (window);
+  gboolean has_been_shown;
+
+  has_been_shown = wl_window->has_been_shown;
+  wl_window->has_been_shown = TRUE;
+
+  if (!has_been_shown)
+    meta_compositor_sync_updates_frozen (window->display->compositor, window);
+}
+
 static void
 meta_window_wayland_init (MetaWindowWayland *wl_window)
 {
@@ -547,6 +562,8 @@ meta_window_wayland_init (MetaWindowWayland *wl_window)
 
   g_signal_connect (window, "notify::appears-focused",
                     G_CALLBACK (appears_focused_changed), NULL);
+  g_signal_connect (window, "shown",
+                    G_CALLBACK (on_window_shown), NULL);
 }
 
 static void
@@ -576,7 +593,9 @@ meta_window_wayland_is_stackable (MetaWindow *window)
 static gboolean
 meta_window_wayland_are_updates_frozen (MetaWindow *window)
 {
-  return FALSE;
+  MetaWindowWayland *wl_window = META_WINDOW_WAYLAND (window);
+
+  return !wl_window->has_been_shown;
 }
 
 static void