Fix issue with some home button presses being ignored.

We are ignoring home button presses after panning away from
the default screen, when the workspace is still moving slightly.

Also, make the home button a no-op when the user is in the
middle of panning the screen (i.e. finger is still down).

Change-Id: Ida6bad4faaf90b6802aac2cbf3444f76b7b38100
2 files changed