Fix transition animation between context menu/inspector

This removes the "grow from nothing" effect (which may have been a
little overkill) but fixes the situation where the inspector is open
and you click to a new location and it moves to the new location and
then transitions down to the menu (which looks bad).

Change-Id: I19d27da6fea7c36965c83aa73836b1bc870c9bcc
Merge "Fix transition animation between context menu/inspector"