carousel: Support add/remove animations for indicators

Since these animations are time-based and the duration is known, it's
enough to just have a tick callback triggering redraws for the indicator
widget on each frame until the time runs out.

Signed-off-by: Alexander Mikhaylenko <>
12 jobs for wip/exalm/paginator-animate in 15 minutes and 1 second (queued for 3 seconds)