[gtk/wip/chergert/gdk-macos-gl-renderer: 4/6] macos: be tolerant of NULL GL context

[Christian Hergert <chergert src gnome org>]

commit ff582977a2d021b35d452278b355bb3fe1e976ff
Author: Christian Hergert <chergert redhat com>
Date:   Thu Oct 29 09:46:02 2020 -0700

    macos: be tolerant of NULL GL context
    
    Some code appears to unconditionally attempt to make the context current,
    so this makes things tolerant to a NULL GdkGLContext and just return FALSE.

 gdk/macos/gdkmacosdisplay.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/gdk/macos/gdkmacosdisplay.c b/gdk/macos/gdkmacosdisplay.c
index 6a89def8c1..665a567e70 100644
--- a/gdk/macos/gdkmacosdisplay.c
+++ b/gdk/macos/gdkmacosdisplay.c
@@ -649,7 +649,10 @@ gdk_macos_display_make_gl_context_current (GdkDisplay   *display,
                                            GdkGLContext *gl_context)
 {
   g_assert (GDK_IS_MACOS_DISPLAY (display));
-  g_assert (GDK_IS_MACOS_GL_CONTEXT (gl_context));
+  g_assert (!gl_context || GDK_IS_MACOS_GL_CONTEXT (gl_context));
+
+  if (gl_context == NULL)
+    return FALSE;
 
   return _gdk_macos_gl_context_make_current (GDK_MACOS_GL_CONTEXT (gl_context));
 }