Bug fix #33826

Post 2.65a issue

Now scrollbars appear/disappear correctly, a bug in checking if mouse clicks
where on panel headers popped up. That disabled using scrollers next to a
panel header.



git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53731 954f8c5b-7b00-dc11-b283-0030488c597c