1875211 - Ensure `TransformEnd` notification after the last animation sampled offset was reflected to the content process

Status: NEW

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

Description

[Hiroyuki Ikezoe (:hiro)]

This is one of the causes of a intermittent failure bug (bug 1875019).

When we sample APZ animations, if the sample is the last one, we set NOTHING state immediately but unfortunately a RepaintRequest call soon after invoked isn't processed immediately because of (probably) RepaintThread.

For the intermittent bug, I will do a workaround to split await Promise.all([promiseApzFlushedRepaints(), transformEndPromise]); into two independent parts await transformEndPromise; and await promiseApzFlushedRepaints();.

CCing Dan since I guess this race also affects scrollend event.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:botond, could you have a look please?

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