[Bf-codereview] Drag to close areas (issue 6269044)

[brechtvanlommel at gmail.com]

Checking for the info window does not really address the issue. If you
drag in that situation, some screen state ends up wrong, in this case
with the outliner header that gets hidden. That can still happen with
other spaces types.

http://codereview.appspot.com/6269044/