[ENHANCEMENT] Scroll active (HEAD-pointed) local branch into view (when LOCAL BRANCHES list is tall)

[goran-w]

NOTE: This is a low-prio suggestion, but would still be nice to have.

Problem: The LOCAL BRANCHES list is expanded by default, and if there are a lot of local branches the active (HEAD-pointed, green checkmark, if any) branch could be scrolled out of view - which can be a bit disorienting. (NOTE: When re-activating a repo-tab, the LOCAL BRANCHES list is scrolled-to-top and its selection is cleared.)

Solution: Make the active branch be automatically scrolled-into-view in the LOCAL BRANCHES list, whenever a repo-tab becomes (re-)activated (switched-to). (NOTE: No selection needs to be changed, I just want to be able to see the green checkmark in the list.)

Motivation: A similar feature is already implemented for the graph/log area, where the currently selected commit is automatically scrolled-into-view. (Also, this feature is not affected by my suggestion, which does not change any selection.)