MetaFrameBorders: Add meta_frame_borders_clear

Just a quick little commit to help clean things up for when we add invisible
borders. Additionally, do a little housekeeping in preview-widget as well.

https://bugzilla.gnome.org/show_bug.cgi?id=644930

NOTE: Patch copied from metacity and adapted for marco.

upstream commit:
https://gitlab.gnome.org/GNOME/metacity/commit/7d519b3f

1 files changed, 34 insertions, 0 deletions

diff --git a/src/core/common.c b/src/core/common.c
new file mode 100644
index 00000000..c7fe1012
--- /dev/null
+++ b/src/core/common.c
@@ -0,0 +1,34 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+/* Metacity X window decorations */
+
+/* 
+ * Copyright (C) 2001 Havoc Pennington
+ * Copyright (C) 2003, 2004 Red Hat, Inc.
+ * Copyright (C) 2005 Elijah Newren
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include "common.h"
+
+void
+meta_frame_borders_clear (MetaFrameBorders *self)
+{
+  self->visible.top = 0;
+  self->visible.bottom = 0;
+  self->visible.left = 0;
+  self->visible.right = 0;
+}