Update progressbar without destroying it

I'd like to update my progressbar value without destroying the bar. I need something like reanmiate the bar.

I have some values which get refreshed every 10 seconds. I don't want to delete 8 bars and recreate 8 bars every 10 seconds. Intead i'd like to set the value to X every 10 seconds and reanmiate the bars but how do i get this done?

Start by locating the progressbar value-update and animation entry points in the repository. Repeatedly set a bar's value every 10 seconds without destroying or recreating it, and verify that existing bars reanimate correctly while their values change.

Written by the indexing model from the issue text.