Keep layout from overwriting translate dimensions

If the layout goes through more than one pass after detecting a window
movement but before animation begins then the later pass overwrites
the animation offsets. The incorrect values are large leading to an
animation starting location in the bottom right corner.

Fixes bug 6450310.

Change-Id: I0f74e67b3e9a15a9246151abf6d47384509340e9
1 file changed