[mutter] tests/stage-view: Give outer container an explicit size

[Marge Bot <marge-bot src gnome org>]

commit 995ee2b63857644980e0bfbfeeb34b7a0a309a1f
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Jun 29 19:59:21 2022 +0200

    tests/stage-view: Give outer container an explicit size
    
    The test case checks that the stage views of hidden actors are
    not updated when the views of the visible outer parent change.
    
    The check for the outer parent's updated stage views currently
    relies on ClutterFixedLayout not excluding hidden children in
    its size request: As the container doesn't contain any visible
    children at that point, its size would change to 0x0 and end
    up on no stage view (rather than the assumed two).
    
    Avoid that oddity by giving the outer container a fixed size,
    so that the visibility of its child doesn't affect the test
    when we fix ClutterFixedLayout.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2488>

 src/tests/stage-view-tests.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/tests/stage-view-tests.c b/src/tests/stage-view-tests.c
index 4ce1a70f9f..9007a6abdd 100644
--- a/src/tests/stage-view-tests.c
+++ b/src/tests/stage-view-tests.c
@@ -395,6 +395,7 @@ meta_test_actor_stage_views_hide_parent (void)
   stage_views = clutter_stage_peek_stage_views (CLUTTER_STAGE (stage));
 
   outer_container = clutter_actor_new ();
+  clutter_actor_set_size (outer_container, 50, 50);
   clutter_actor_add_child (stage, outer_container);
 
   inner_container = clutter_actor_new ();