Found while fuzzing m-c 20220414-6c55ba30c858 (--enable-debug --enable-fuzzing)

To reproduce via Grizzly Replay:

$ pip install fuzzfetch grizzly-framework
$ python -m fuzzfetch -d --fuzzing -n firefox
$ python -m grizzly.replay ./firefox/firefox testcase.jpg

Assertion failure: mDecoded.IsEqualEdges(frameRect), at /builds/worker/checkouts/gecko/image/imgFrame.cpp:547

#0 0x7f83b5ae52c0 in mozilla::image::imgFrame::Finish(mozilla::image::Opacity, bool) /builds/worker/checkouts/gecko/image/imgFrame.cpp:547:3
#1 0x7f83b5a826ce in mozilla::image::Decoder::PostFrameStop(mozilla::image::Opacity) /builds/worker/checkouts/gecko/image/Decoder.cpp:480:18
#2 0x7f83b5a8248a in mozilla::image::Decoder::CompleteDecode() /builds/worker/checkouts/gecko/image/Decoder.cpp:246:5
#3 0x7f83b5a748d3 in mozilla::image::Decoder::Decode(mozilla::image::IResumable*) /builds/worker/checkouts/gecko/image/Decoder.cpp:197:3
#4 0x7f83b5a80683 in mozilla::image::DecodedSurfaceProvider::Run() /builds/worker/checkouts/gecko/image/DecodedSurfaceProvider.cpp:125:34
#5 0x7f83b5a981a3 in mozilla::image::DecodingTask::Run() /builds/worker/checkouts/gecko/image/DecodePool.cpp:146:12
#6 0x7f83b44dff77 in mozilla::TaskController::RunPoolThread() /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:256:33
#7 0x7f83ca0c9a57 in _pt_root /builds/worker/checkouts/gecko/nsprpub/pr/src/pthreads/ptthread.c:201:5
#8 0x7f83cae43608 in start_thread /build/glibc-sMfBJT/glibc-2.31/nptl/pthread_create.c:477:8
#9 0x7f83caa0a162 in __clone /build/glibc-sMfBJT/glibc-2.31/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95

A Pernosco session is available here: https://pernos.co/debug/G5tcIqOnUMZJH6q49DZ12Q/index.html

Bugmon Analysis
Verified bug as reproducible on mozilla-central 20220421152318-c95859201259.
The bug appears to have been introduced in the following build range:

Start: 55ab13abb8c2465b2d68f25ea6a4abf2647e4a76 (20211006135407)
End: ef7b596bb385f46280eb1492009bf8fb541e17db (20211006152024)
Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=55ab13abb8c2465b2d68f25ea6a4abf2647e4a76&tochange=ef7b596bb385f46280eb1492009bf8fb541e17db

Set release status flags based on info from the regressing bug 1732115

:aosmond, since you are the author of the regressor, bug 1732115, could you take a look?
For more information, please visit auto_nag documentation.

https://hg.mozilla.org/mozilla-central/rev/adf9fd785bb9

Bugmon Analysis
Verified bug as fixed on rev mozilla-central 20220507213841-1d8f6404d0b9.
Removing bugmon keyword as no further action possible. Please review the bug and re-add the keyword for further analysis.

The patch landed in nightly and beta is affected.
:tnikkel, is this bug important enough to require an uplift?
If not please set status_beta to wontfix.

For more information, please visit auto_nag documentation.