[gtk+] stack: always update window position at transition start

[Matthew Watson <watson src gnome org>]

commit 175cf7e32d39be2b2f1afff9ef7c16dc49b75289
Author: Matt Watson <mattdangerw gmail com>
Date:   Fri May 13 00:22:20 2016 -0700

    stack: always update window position at transition start
    
    Sometimes on wayland we're seeing a frame draw before the first tick
    callback, where the window position has not yet been updated.
    
    With this change, the window is properly positioned as soon as
    gtk_stack_start_transition returns.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=766405

 gtk/gtkstack.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkstack.c b/gtk/gtkstack.c
index 882829c..38b54ec 100644
--- a/gtk/gtkstack.c
+++ b/gtk/gtkstack.c
@@ -1029,8 +1029,9 @@ gtk_stack_start_transition (GtkStack               *stack,
       gtk_stack_unschedule_ticks (stack);
       priv->active_transition_type = GTK_STACK_TRANSITION_TYPE_NONE;
       gtk_progress_tracker_finish (&priv->tracker);
-      gtk_stack_progress_updated (GTK_STACK (widget));
     }
+
+  gtk_stack_progress_updated (GTK_STACK (widget));
 }
 
 static void