[mutter] wayland: Ensure we queue a "calc showing" operation after we get a buffer

[Carlos Garnacho <carlosg src gnome org>]

commit cdac4d0e92ea7b6a82101ac2b8723e893c53b3e3
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Jun 8 11:59:42 2015 +0200

    wayland: Ensure we queue a "calc showing" operation after we get a buffer
    
    This will ensure the window is made visible, now that we're going to ignore
    all previous petitions until we get a buffer.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=750552

 src/wayland/meta-wayland-surface.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/wayland/meta-wayland-surface.c b/src/wayland/meta-wayland-surface.c
index 0f2714f..2a0db22 100644
--- a/src/wayland/meta-wayland-surface.c
+++ b/src/wayland/meta-wayland-surface.c
@@ -486,6 +486,9 @@ apply_pending_state (MetaWaylandSurface      *surface,
 
   if (pending->newly_attached)
     {
+      if (!surface->buffer && surface->window)
+        meta_window_queue (surface->window, META_QUEUE_CALC_SHOWING);
+
       surface_set_buffer (surface, pending->buffer);
 
       if (pending->buffer)