Usability:

Ancient annoying thing for zooming in 2d views: when a view was restricted to keep
aspect ratio, it only allowed vertical or horizontal MMB-drag zooms, depending 
portrait or landscape size of editors. Same for trackpad and magic mouse.

Now vertical zoom drag always works for editors like buttons, nodes.



git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53738 954f8c5b-7b00-dc11-b283-0030488c597c