1753334 - Use the latest async offset if there's no scroll linked effects

Status: NEW

(Core :: Panning and Zooming, enhancement, P2)

Description

[Hiroyuki Ikezoe (:hiro)]

Since bug 1571758 we have two async scroll offsets, the one-frame delay one and the latest one. Always using the latest one would mitigate bug 1640060.

It should be behind a pref which is off by default initially.

Comment 1

[Hiroyuki Ikezoe (:hiro)]

Attachment: WIP: Bug 1753334 - Add a pref to use the latest async scroll offset.

Comment 2

[Hiroyuki Ikezoe (:hiro)]

Note that I heard that Glenn isn't a big fan of using prefs in Rust part of WebRender. An alternative way to avoid using prefs in Rust is to propagate the pref information into ScrollFrameInfo from the main-thread. There will be a race the pref isn't immediately reflected, but it wouldn't be a big problem. An advantage of the alternative way is, we may be able to control the behavior in more fine-grained, per scrollable frame or something like that. I am not sure it's useful or not as of now.