If the user is scaling out again we need to make sure that our offsets
are adjusted so that we always show a subset of the profile and not
'empty space' outside of it. Instead of reimplementing the offset logic,
let's just trigger another paint() call.
This requires a trampoline function because of different signal and slot
signatures.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>