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(In reply to Florian Quèze [:florian] [:flo] from bug 1354782 comment 4) > > > (for a follow-up) Could we save the pinned tab's width once at the time the > > > tab is pinned (or soon after), and avoid this getBoundingClientRect call > > > completely? > > > > Yes, but with two caveats: > > > > - We already flush layout before the loop, so getBoundingClientRect is cheap > > at this point. We'd have to cache scrollButtonWidth and paddingStart too. > > > > - We'd have to clear the cache when the theme layout changes (e.g. when > > enabling a compact theme, but we already call _positionPinnedTabs there for > > the same reason, so it's probably not a big deal) > > > > Do you think the added complexity would be worth it? > > Yes. Any layout flush we can remove (especially when they are during user > interactions where smooth visual feedback is expected like resizing) is > worth it. But it's not worth blocking landing of removing the invalidation > loop for several days, this is why I said "for a follow-up". Up to you to > decide if you want to try here or file a lower priority follow-up :-).
Comment on attachment 8856170 [details] Bug 1354789 - Cache layout information needed in _positionPinnedTabs. https://reviewboard.mozilla.org/r/128096/#review130874
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/autoland/rev/ee9bd670aadf Cache layout information needed in _positionPinnedTabs. r=florian