This is needed after the merge of lp:~ismise/unity/fix-864708 due that caused a bug similar to the bug #870844 that I previously fixed (before the merging of the previously mentioned branch) with the lp:~3v1n0/unity/fix-panel-dash-interactions branch.

I'm proposing the fix against lp:unity, however maybe for consistency it should be backported to lp:unity/4.0 too.. Fixes: https://bugs.launchpad.net/bugs/873100. Reviewed by Tim Penhey.