[gtk/popup-shadow-width] macos: mark region as unlikely

[Matthias Clasen <matthiasc src gnome org>]

commit c9fe4d9e32c90c51072279a503f08a4958750971
Author: Christian Hergert <chergert redhat com>
Date:   Mon Feb 8 09:51:58 2021 -0800

    macos: mark region as unlikely

 gdk/macos/gdkmacosglcontext.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gdk/macos/gdkmacosglcontext.c b/gdk/macos/gdkmacosglcontext.c
index 2cd68e31d4..8dd6bc2e00 100644
--- a/gdk/macos/gdkmacosglcontext.c
+++ b/gdk/macos/gdkmacosglcontext.c
@@ -136,7 +136,7 @@ ensure_gl_view (GdkMacosGLContext *self)
   nsview = _gdk_macos_surface_get_view (surface);
   nswindow = _gdk_macos_surface_get_native (surface);
 
-  if (!GDK_IS_MACOS_GL_VIEW (nsview))
+  if G_UNLIKELY (!GDK_IS_MACOS_GL_VIEW (nsview))
     {
       NSRect frame;