1794708 - Get the assertion if the scroll range become zero due to the removal of children

Status: ASSIGNED

(Core :: CSS Transitions and Animations, defect, P3)

Description

[Boris Chiou [:boris]]

We hit this assertion [1] by manipulating the DOM APIs. Example is in this patch: https://phabricator.services.mozilla.com/D159110

[1] https://searchfox.org/mozilla-central/rev/f118dae98073bc17efb8604a32abfcb7b4e05880/gfx/layers/AnimationHelper.cpp#49-51

Comment 1

[Boris Chiou [:boris]]

Attachment: Bug 1794708 - Fix the assertion when manipulating scroll-container by DOM APIs.

It's possible to make the scroll range become zero by removing/moving
the desendants of the scroll container. It's still possible to get a
zero scroll range on the compositor. Basically we restyle those elements
on the main thread, so it should be fine to skip this case.

Comment 2

[Frank Griffith Jr]

After discussion with Boris, lowering to S3.