fix(theme): outline marker flicks when navigating towards above

[zonemeen]

fix #2665

[xsjcTony]

👀

[brc-dd]

I don't think this exactly fixes the bug. Sure reduces it by some factor 👀

ezgif-5-c0f4a050cb.mov

(at 0.5x slowdown)

Also, removing debouncing completely is not a good solution. This currently takes 1-2ms each time the scroll event fires (and scroll fires a lot!).

For most of the times that "flick" is not much noticeable. (Honestly, to me, that always seemed like cool easeOutBack transition. 😅)

[zonemeen]

If the time between two clicks is too short, the flick is obvious. This problem was introduced by #2527. Since the two requestAnimationFrames are triggered almost simultaneously, and then one of them was delayed, resulting in a flick.

I guess need to modify the implementation of #2527 to avoid using two requestAnimationFrames.🤔