I confirmed I can reproduce on macOS using the comment 3 STR with current Nightly, btw. (Up until now I've been testing on Linux, Ubuntu 22.04 with Wayland.) Bisecting a bit further beyond comment 4 (on Linux): Nightly 2021-02-16 is "good" and Nightly 2021-02-17 is "bad". That gives this regression pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=c1db635de2e140dcf35e5a93e0e8fd94fa7474f3&tochange=6d7590bfd8d37fd1088f8d184702238881fc048b It's not obvious to me what in there would be responsible, though. Bug 1681356 seems conceivably-related but it's Linux-specific which probably means it can't be related (since per above, this repro's on multiple platforms).
Bug 1880685 Comment 5 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
I confirmed I can reproduce on macOS using the comment 3 STR with current Nightly, btw. (Up until now I've been testing on Linux -- specifically, Ubuntu 22.04 with Wayland.) Bisecting a bit further beyond comment 4 (on Linux): Nightly 2021-02-16 is "good" and Nightly 2021-02-17 is "bad". That gives this regression pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=c1db635de2e140dcf35e5a93e0e8fd94fa7474f3&tochange=6d7590bfd8d37fd1088f8d184702238881fc048b It's not obvious to me what in there would be responsible, though. Bug 1681356 seems conceivably-related but it's Linux-specific which probably means it can't be related (since per above, this repro's on multiple platforms).