Themes: Update last postFinish call

* Previous patchset changed postFinish function signature.

Change-Id: Ibe07435e274054c7203504bc4b0877b4df006893
WallpaperCropper: do not display null bitmaps

It is possible that themes can include a corrupted bitmap,
and the lockscreen will try and display a NULL image resulting in an
empty thumbnail and applying it will cause the app to crash.

Change-Id: Ie0770486a9d58050a5f296a219d844a39937421e
Signed-off-by: Roman Birg <roman@cyngn.com>
fw: media: Handle NPE due to threading race

Change-Id: I6eab5bc3d687edfa6f0839e439b3314bed4fdcea
Temporarily hide lock screen unlock targets if opening a widget

If the user selects a widget to open, it's very unlikely that they would
want to use any of the slider shortcuts at that moment. Make it easier
to unlock the screen and open the desired widget by temporarily hiding
other targets.

Change-Id: I51d879cc77826e4f7235c5d35b6352e5e83bb7cf