1745119 - Apply scroll generation based scroll offsets to the zoom container when the document gets zoomed in

Status: NEW

(Core :: Panning and Zooming, defect, P3)

Description

[Hiroyuki Ikezoe (:hiro)]

Attachment: visual-viewport-scroll-linked-effect.html

In bug 1571758 we are going to introduce a new machinery to choose an appropriate scroll offset which was sampled by an APZC to mitigate gaps between the offset used on the main-thread and the sampled offset. But we don't apply the new machinery for the zoom container, specifically this GetCurrentAsyncTransform call.

Attaching file an example to see the gap when the example html is zoomed in. The exampled doesn't listen normal scroll events, it rather listens visualViewport's scroll events.

As far as I know, there's no bug report about this case, so I assume it's rarely used, so I am setting P3/S3 for now to this bug.

Comment 1

[Hiroyuki Ikezoe (:hiro)]

The bug title was slightly misleading, the scroll offset on the zoom container will basically be using generation based offsets, but it's not going to work with zoomed in.