This change renders a striped background in the
'barber pole' in HaikuDepot application when it is
idle. This makes the 'barber pole' easier to use
in situations where the space that the UI control
takes up should not be blank. The logic for the
striped background is from the 'drivesetup'
application.
Change-Id: I87791c70b4d1a21d91e661433d6c940ca69ece87
Reviewed-on: https://review.haiku-os.org/c/1674
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
02e836dc3c