> On test plans, I see both this bug and the other one will be individually 
> tested,
> but what's the plan to ensure that other behaviour in mutter isn't regressed?

Mutter and GNOME Shell are massive projects so the next bug is always
somewhere you don't expect. I would not recommend focussing permanent
test plans on any regressions that were found in 2023. Specifically
addressing each one:

Bug 2026887: Caused by a narrow hardware/kernel combination. No more
important than any other CPU model or kernel release.

Bug 2023759: Caused by a lack of testing remote desktop (upstream too).
This could obviously be better tested but I argue the feature is too
obscure to be a top-level test case we ask anyone to do on every update.

Bug 2023363: Caused by 16 milliseconds being too small a difference for
most to notice.

Bug 2023766: Microstutters of a few milliseconds were a regression in
41.0 and went mostly unnoticed by everyone for several years because of
how minor it is.

Bug 2017097: Caused by a combination of being too hard to notice for
people who did test Raspi, and me being only one person too busy dealing
with a rewrite of triple buffering caused by a last-minute upstream API
redesign in 44.0.

Bug 2017137: Caused by a combination of being too hard to notice for
people who did test Xorg, and me being only one person too busy dealing
with a rewrite of triple buffering caused by a last-minute upstream API
redesign in 44.0.

To find future regressions more effectively we need both more people
testing proposed for longer, and more hardware/software combinations.
Perhaps slower phasing too since such obscure bugs are so easy to miss
by most people.

This isn't just a mutter issue. Almost every day I track obscure bugs
back to the kernel caused by hardware combinations we simply can't
expect to get tested exhaustively before every release.

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https://bugs.launchpad.net/bugs/2023766

Title:
  Mouse cursor stutters over GUI elements that are animated

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