[gtk/wip/chergert/glproto: 452/526] specifically set clear color

[Christian Hergert <chergert src gnome org>]

commit 4068949ecf5ae8611df3e20dce93d5a545243b49
Author: Christian Hergert <chergert redhat com>
Date:   Thu Feb 4 12:55:56 2021 -0800

    specifically set clear color

 gsk/next/gskglcommandqueue.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gsk/next/gskglcommandqueue.c b/gsk/next/gskglcommandqueue.c
index 7f5b441168..82ec6c13cc 100644
--- a/gsk/next/gskglcommandqueue.c
+++ b/gsk/next/gskglcommandqueue.c
@@ -851,6 +851,7 @@ gsk_gl_command_queue_execute (GskGLCommandQueue    *self,
                           batch->any.viewport.width,
                           batch->any.viewport.height);
 
+          glClearColor (0, 0, 0, 0);
           glClear (batch->clear.bits);
         break;