1866845 - Improve focus logic in fxview-tab-list

Status: NEW

(Firefox :: Firefox View, task, P3)

Description

[Kelly Cochrane [:kcochrane]]

Adding this as a follow-up to bug 1859788 (see this comment specifically). We want to do two things if possible:

1. Remove the manual requestUpdate() and updateComplete calls on every sublist in the root virtual-list. There should theoretically be a way to have property updates on the top-level virtual-list (such as activeIndex) that trigger a re-render on sublists.
2. Use scrollIntoView() only when necessary when focusing and use { block: "nearest" } rather than { block: "center" } if possible given the sticky header obscuring some of the items towards the top of the viewport.