Unassigning self from work that I do not expect to be able to get to soon.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

This test now passes:
rtd --additional-driver-flag=--enable-slimming-paint-v2 fast/forms/relayout-shifts-inner-editor.html
...
The test ran as expected.

Woohoo!