Make tree fragment's expandable current view expand by default

This gives the user a clearer overview of the current state of the
application, without having to expand all the tasks.

Padding has been reduced to better utilize available screen space.

The bring to front and remove buttons are currently always hidden.

Test: Manual
Change-Id: Ifcda0ff31fd5adb89a12ff6a024842c0e7a7ab29
10 files changed