App sidebar: small cleanup

Change-Id: I319b12dbe2489d4087a7bab11f655423f17fb0b3
Frameworks: notify arrayadapter early that data has changed on clear all

Recent clear all. Current behaviour is that we do not update the array adapter at all
due that it gets rebuild on next reload. But in very rare cases it happens that getView
want to update shortly after all is cleared althought the view is not visible anymore.

Whatever just call notifyDataSetChanged after List is cleared to work against it.

Change-Id: I61ca25358ebe164336ba349565459537861c5495
Frameworks: do not kill favorite recent apps

Due of a lot user requests and I basically like the idea (not a fan of clear all apps at all
due that it does not make sense android wise) we ehance the favorite recent apps feature.

This commit basically does not remove the apps from the task list which were marked from the user
as favorite.

3 possibilities:

- No favorites are in the task list - clear all behaves like it was before - all tasks cleared and panel closes

- favorites and non favorites are in the task list - clear all removes all non favorite tasks and favorite tasks stay.
  Yes without fancy animations....we want to be fast ;) - panel stays open

- only favorites are in the list - pinch to zoom out is blocked due that nothing is there to clear all.

single clear of a task with swipe behaves in all cases normal like it was before this change

Change-Id: Ia05562e0f59dfb023aa65ec3a40dd951594dc88e
Frameworks: fix possible NPE + and missing expandable panel correction

Thanks Jorge for pointing it out. This version is way nicer.

Change-Id: I7a65a05ef533c90cbfc68d4de996eae7a0ff66b7