[gtk+] tests: wait for draw before fetching tree view style

[Cosimo Cecchi <cosimoc src gnome org>]

commit cfbd862aaeff20dac6c372e07f4107622ee44b08
Author: Cosimo Cecchi <cosimo endlessm com>
Date:   Tue May 19 10:25:00 2015 -0700

    tests: wait for draw before fetching tree view style
    
    On some slower machines (e.g. an ARM OBS builder), this test is failing
    with a race condition where we're trying to fetch the style before it's
    applied.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=749593

 testsuite/gtk/treeview.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/testsuite/gtk/treeview.c b/testsuite/gtk/treeview.c
index 758b52c..0f301d8 100644
--- a/testsuite/gtk/treeview.c
+++ b/testsuite/gtk/treeview.c
@@ -211,6 +211,7 @@ test_row_separator_height (void)
   gtk_container_add (GTK_CONTAINER (window), tree_view);
   gtk_widget_show_all (window);
 
+  gtk_test_widget_wait_for_draw (window);
 
   path = gtk_tree_path_new_from_indices (2, -1);
   gtk_tree_view_get_background_area (GTK_TREE_VIEW (tree_view),