From 04c40a4232e3a6d910ed25057b41f4ac67c63cc5 Mon Sep 17 00:00:00 2001
From: Thomas Geymayer <tomgey@gmail.com>
Date: Mon, 24 Mar 2014 00:18:29 +0100
Subject: [PATCH] canvas.gui.ScrollArea: check for valid content bounding box.

---
 Nasal/canvas/gui/widgets/ScrollArea.nas | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Nasal/canvas/gui/widgets/ScrollArea.nas b/Nasal/canvas/gui/widgets/ScrollArea.nas
index cd5fc26ff..b39e12fc5 100644
--- a/Nasal/canvas/gui/widgets/ScrollArea.nas
+++ b/Nasal/canvas/gui/widgets/ScrollArea.nas
@@ -45,6 +45,11 @@ gui.widgets.ScrollArea = {
   {
     # TODO only update on content resize
     var bb = me.getContent().getTransformedBounds();
+
+    if( bb[2] < bb[0] or bb[3] < bb[1] )
+      # Do nothing with invalid bounding box (probably no content yet)
+      return me;
+
     var w = bb[2] - bb[0];
     var h = bb[3] - bb[1];