Found while fuzzing m-c 20221207-8e09abeeb445 (--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.html

Assertion failure: !mNextPageContentFramePageName (PageContentFrame page name was already set), at /builds/worker/checkouts/gecko/layout/base/nsCSSFrameConstructor.h:302

#0 0x7f4f9bbc2201 in SetNextPageContentFramePageName /builds/worker/checkouts/gecko/layout/base/nsCSSFrameConstructor.h:301:5
#1 0x7f4f9bbc2201 in nsBlockFrame::ReflowDirtyLines(mozilla::BlockReflowState&) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:2890:42
#2 0x7f4f9bbbc5fb in nsBlockFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:1470:3
#3 0x7f4f9bbcd0d1 in nsBlockReflowContext::ReflowBlock(mozilla::LogicalRect const&, bool, nsCollapsingMargin&, int, nsLineBox*, mozilla::ReflowInput&, nsReflowStatus&, mozilla::BlockReflowState&) /builds/worker/checkouts/gecko/layout/generic/nsBlockReflowContext.cpp:290:11
#4 0x7f4f9bbc9444 in nsBlockFrame::ReflowBlockFrame(mozilla::BlockReflowState&, nsLineList_iterator, bool*) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:4032:11
#5 0x7f4f9bbc6bb1 in nsBlockFrame::ReflowLine(mozilla::BlockReflowState&, nsLineList_iterator, bool*) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:3378:5
#6 0x7f4f9bbc0de8 in nsBlockFrame::ReflowDirtyLines(mozilla::BlockReflowState&) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:2895:9
#7 0x7f4f9bbbc5fb in nsBlockFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:1470:3
#8 0x7f4f9bbe0339 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1029:14
#9 0x7f4f9bbe21f1 in nsColumnSetFrame::ReflowColumns(mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&, nsColumnSetFrame::ReflowConfig const&, bool) /builds/worker/checkouts/gecko/layout/generic/nsColumnSetFrame.cpp:664:7
#10 0x7f4f9bbe3b6f in nsColumnSetFrame::FindBestBalanceBSize(mozilla::ReflowInput const&, nsPresContext*, nsColumnSetFrame::ReflowConfig&, nsColumnSetFrame::ColumnBalanceData, mozilla::ReflowOutput&, bool, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsColumnSetFrame.cpp:1098:9
#11 0x7f4f9bbe43b9 in nsColumnSetFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsColumnSetFrame.cpp:1209:5
#12 0x7f4f9bbcd0d1 in nsBlockReflowContext::ReflowBlock(mozilla::LogicalRect const&, bool, nsCollapsingMargin&, int, nsLineBox*, mozilla::ReflowInput&, nsReflowStatus&, mozilla::BlockReflowState&) /builds/worker/checkouts/gecko/layout/generic/nsBlockReflowContext.cpp:290:11
#13 0x7f4f9bbc9444 in nsBlockFrame::ReflowBlockFrame(mozilla::BlockReflowState&, nsLineList_iterator, bool*) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:4032:11
#14 0x7f4f9bbc6bb1 in nsBlockFrame::ReflowLine(mozilla::BlockReflowState&, nsLineList_iterator, bool*) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:3378:5
#15 0x7f4f9bbc0de8 in nsBlockFrame::ReflowDirtyLines(mozilla::BlockReflowState&) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:2895:9
#16 0x7f4f9bbbc5fb in nsBlockFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsBlockFrame.cpp:1470:3
#17 0x7f4f9bbe0339 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1029:14
#18 0x7f4f9bbdf899 in nsCanvasFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsCanvasFrame.cpp:754:7
#19 0x7f4f9bbb0f26 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, int, int, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1069:14
#20 0x7f4f9bcee50e in nsPageContentFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsPageContentFrame.cpp:76:5
#21 0x7f4f9bbb0f26 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, int, int, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1069:14
#22 0x7f4f9bcf10a6 in nsPageFrame::ReflowPageContent(nsPresContext*, mozilla::ReflowInput const&) /builds/worker/checkouts/gecko/layout/generic/nsPageFrame.cpp:194:3
#23 0x7f4f9bcf1940 in nsPageFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsPageFrame.cpp:217:13
#24 0x7f4f9bbe0339 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1029:14
#25 0x7f4f9bb8bc79 in mozilla::PrintedSheetFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/PrintedSheetFrame.cpp:132:5
#26 0x7f4f9bbb0f26 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, int, int, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1069:14
#27 0x7f4f9bcf542d in nsPageSequenceFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsPageSequenceFrame.cpp:370:5
#28 0x7f4f9bbe0339 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1029:14
#29 0x7f4f9bbdf899 in nsCanvasFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsCanvasFrame.cpp:754:7
#30 0x7f4f9bbe0339 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1029:14
#31 0x7f4f9bc289b0 in nsHTMLScrollFrame::ReflowScrolledFrame(mozilla::ScrollReflowInput&, bool, bool, mozilla::ReflowOutput*) /builds/worker/checkouts/gecko/layout/generic/nsGfxScrollFrame.cpp:840:3
#32 0x7f4f9bc2973f in nsHTMLScrollFrame::ReflowContents(mozilla::ScrollReflowInput&, mozilla::ReflowOutput const&) /builds/worker/checkouts/gecko/layout/generic/nsGfxScrollFrame.cpp:976:3
#33 0x7f4f9bc2e24d in nsHTMLScrollFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/nsGfxScrollFrame.cpp:1403:3
#34 0x7f4f9bbb0f26 in nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, int, int, nsIFrame::ReflowChildFlags, nsReflowStatus&, nsOverflowContinuationTracker*) /builds/worker/checkouts/gecko/layout/generic/nsContainerFrame.cpp:1069:14
#35 0x7f4f9bbb0674 in mozilla::ViewportFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) /builds/worker/checkouts/gecko/layout/generic/ViewportFrame.cpp:384:7
#36 0x7f4f9baab3da in mozilla::PresShell::DoReflow(nsIFrame*, bool, mozilla::OverflowChangedTracker*) /builds/worker/checkouts/gecko/layout/base/PresShell.cpp:9687:11
#37 0x7f4f9bacf45f in mozilla::PresShell::ProcessReflowCommands(bool) /builds/worker/checkouts/gecko/layout/base/PresShell.cpp:9859:24
#38 0x7f4f9bab4e39 in DoFlushLayout /builds/worker/checkouts/gecko/layout/base/PresShell.cpp:9929:10
#39 0x7f4f9bab4e39 in mozilla::PresShell::DoFlushPendingNotifications(mozilla::ChangesToFlush) /builds/worker/checkouts/gecko/layout/base/PresShell.cpp:4440:11
#40 0x7f4f9bf234e0 in nsPrintJob::ReflowPrintObject(mozilla::UniquePtr<nsPrintObject, mozilla::DefaultDelete<nsPrintObject>> const&) /builds/worker/checkouts/gecko/layout/printing/nsPrintJob.cpp:1400:14
#41 0x7f4f9bf2294a in nsPrintJob::ReflowDocList(mozilla::UniquePtr<nsPrintObject, mozilla::DefaultDelete<nsPrintObject>> const&) /builds/worker/checkouts/gecko/layout/printing/nsPrintJob.cpp:957:3
#42 0x7f4f9bf1fb17 in nsPrintJob::InitPrintDocConstruction(bool) /builds/worker/checkouts/gecko/layout/printing/nsPrintJob.cpp:996:5
#43 0x7f4f9bf1ea6c in nsPrintJob::DoCommonPrint(bool, nsIPrintSettings*, nsIWebProgressListener*, mozilla::dom::Document&) /builds/worker/checkouts/gecko/layout/printing/nsPrintJob.cpp:445:3
#44 0x7f4f9bf1fe1a in CommonPrint /builds/worker/checkouts/gecko/layout/printing/nsPrintJob.cpp:334:17
#45 0x7f4f9bf1fe1a in nsPrintJob::PrintPreview(mozilla::dom::Document&, nsIPrintSettings*, nsIWebProgressListener*, std::function<void (mozilla::dom::PrintPreviewResultInfo const&)>&&) /builds/worker/checkouts/gecko/layout/printing/nsPrintJob.cpp:466:17
#46 0x7f4f9bb3269c in nsDocumentViewer::PrintPreview(nsIPrintSettings*, nsIWebProgressListener*, std::function<void (mozilla::dom::PrintPreviewResultInfo const&)>&&) /builds/worker/checkouts/gecko/layout/base/nsDocumentViewer.cpp:2966:27
#47 0x7f4f97ff9c71 in nsGlobalWindowOuter::Print(nsIPrintSettings*, mozilla::layout::RemotePrintJobChild*, nsIWebProgressListener*, nsIDocShell*, nsGlobalWindowOuter::IsPreview, nsGlobalWindowOuter::IsForWindowDotPrint, std::function<void (mozilla::dom::PrintPreviewResultInfo const&)>&&, mozilla::ErrorResult&) /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowOuter.cpp:5281:33
#48 0x7f4f97fb1139 in nsGlobalWindowInner::PrintPreview(nsIPrintSettings*, nsIWebProgressListener*, nsIDocShell*, mozilla::ErrorResult&) /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowInner.cpp:3931:3
#49 0x7f4f9928438b in mozilla::dom::Window_Binding::printPreview(JSContext*, JS::Handle<JSObject*>, void*, JSJitMethodCallArgs const&) /builds/worker/workspace/obj-build/dom/bindings/WindowBinding.cpp:3784:59
#50 0x7f4f998896c2 in bool mozilla::dom::binding_detail::GenericMethod<mozilla::dom::binding_detail::MaybeCrossOriginObjectThisPolicy, mozilla::dom::binding_detail::ThrowExceptions>(JSContext*, unsigned int, JS::Value*) /builds/worker/checkouts/gecko/dom/bindings/BindingUtils.cpp:3287:13
#51 0x7f4f9db983ec in CallJSNative(JSContext*, bool (*)(JSContext*, unsigned int, JS::Value*), js::CallReason, JS::CallArgs const&) /builds/worker/checkouts/gecko/js/src/vm/Interpreter.cpp:459:13
#52 0x7f4f9db97d0f in js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct, js::CallReason) /builds/worker/checkouts/gecko/js/src/vm/Interpreter.cpp:547:12
#53 0x7f4f9db89722 in CallFromStack /builds/worker/checkouts/gecko/js/src/vm/Interpreter.cpp:619:10
#54 0x7f4f9db89722 in Interpret(JSContext*, js::RunState&) /builds/worker/checkouts/gecko/js/src/vm/Interpreter.cpp:3379:16
#55 0x7f4f9db7d88e in js::RunScript(JSContext*, js::RunState&) /builds/worker/checkouts/gecko/js/src/vm/Interpreter.cpp:431:13
#56 0x7f4f9db97c0b in js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct, js::CallReason) /builds/worker/checkouts/gecko/js/src/vm/Interpreter.cpp:579:13
#57 0x7f4f9db9914c in js::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, js::AnyInvokeArgs const&, JS::MutableHandle<JS::Value>, js::CallReason) /builds/worker/checkouts/gecko/js/src/vm/Interpreter.cpp:646:8
#58 0x7f4f9dc5283c in JS::Call(JSContext*, JS::Handle<JS::Value>, JS::Handle<JS::Value>, JS::HandleValueArray const&, JS::MutableHandle<JS::Value>) /builds/worker/checkouts/gecko/js/src/vm/CallAndConstruct.cpp:117:10
#59 0x7f4f9919bf71 in mozilla::dom::IdleRequestCallback::Call(mozilla::dom::BindingCallContext&, JS::Handle<JS::Value>, mozilla::dom::IdleDeadline&, mozilla::ErrorResult&) /builds/worker/workspace/obj-build/dom/bindings/WindowBinding.cpp:827:8
#60 0x7f4f980b1285 in mozilla::dom::IdleRequestCallback::Call(mozilla::dom::IdleDeadline&, mozilla::ErrorResult&, char const*, mozilla::dom::CallbackObject::ExceptionHandling, JS::Realm*) /builds/worker/workspace/obj-build/dist/include/mozilla/dom/WindowBinding.h:691:12
#61 0x7f4f98228636 in Call /builds/worker/workspace/obj-build/dist/include/mozilla/dom/WindowBinding.h:704:12
#62 0x7f4f98228636 in mozilla::dom::IdleRequest::IdleRun(nsPIDOMWindowInner*, double, bool) /builds/worker/checkouts/gecko/dom/base/IdleRequest.cpp:61:13
#63 0x7f4f97f93bc4 in nsGlobalWindowInner::RunIdleRequest(mozilla::dom::IdleRequest*, double, bool) /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowInner.cpp:729:12
#64 0x7f4f97f929db in nsGlobalWindowInner::ExecuteIdleRequest(mozilla::TimeStamp) /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowInner.cpp:757:3
#65 0x7f4f97f926f1 in IdleRequestExecutor::Run() /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowInner.cpp:598:13
#66 0x7f4f966e7955 in mozilla::RunnableTask::Run() /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:538:16
#67 0x7f4f966e2f3c in mozilla::TaskController::DoExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:851:26
#68 0x7f4f966e1c6e in mozilla::TaskController::ExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:725:15
#69 0x7f4f966e1e65 in mozilla::TaskController::ProcessPendingMTTask(bool) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:461:36
#70 0x7f4f966eb256 in operator() /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:187:37
#71 0x7f4f966eb256 in mozilla::detail::RunnableFunction<mozilla::TaskController::InitializeInternal()::$_2>::Run() /builds/worker/workspace/obj-build/dist/include/nsThreadUtils.h:546:5
#72 0x7f4f96700be8 in nsThread::ProcessNextEvent(bool, bool*) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:1204:16
#73 0x7f4f9670735d in NS_ProcessNextEvent(nsIThread*, bool) /builds/worker/checkouts/gecko/xpcom/threads/nsThreadUtils.cpp:474:10
#74 0x7f4f972f7c13 in mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) /builds/worker/checkouts/gecko/ipc/glue/MessagePump.cpp:85:21
#75 0x7f4f9721cba8 in MessageLoop::RunInternal() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:381:10
#76 0x7f4f9721cab1 in RunHandler /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:374:3
#77 0x7f4f9721cab1 in MessageLoop::Run() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:356:3
#78 0x7f4f9b7271c8 in nsBaseAppShell::Run() /builds/worker/checkouts/gecko/widget/nsBaseAppShell.cpp:150:27
#79 0x7f4f9d9540fb in XRE_RunAppShell() /builds/worker/checkouts/gecko/toolkit/xre/nsEmbedFunctions.cpp:884:20
#80 0x7f4f972f8ad9 in mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*) /builds/worker/checkouts/gecko/ipc/glue/MessagePump.cpp:235:9
#81 0x7f4f9721cba8 in MessageLoop::RunInternal() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:381:10
#82 0x7f4f9721cab1 in RunHandler /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:374:3
#83 0x7f4f9721cab1 in MessageLoop::Run() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:356:3
#84 0x7f4f9d95368c in XRE_InitChildProcess(int, char**, XREChildData const*) /builds/worker/checkouts/gecko/toolkit/xre/nsEmbedFunctions.cpp:743:34
#85 0x562e8570aca0 in content_process_main /builds/worker/checkouts/gecko/browser/app/../../ipc/contentproc/plugin-container.cpp:57:28
#86 0x562e8570aca0 in main /builds/worker/checkouts/gecko/browser/app/nsBrowserApp.cpp:359:18
#87 0x7f4fa9e62d8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#88 0x7f4fa9e62e3f in __libc_start_main csu/../csu/libc-start.c:392:3
#89 0x562e856e1308 in _start (/home/user/workspace/browsers/m-c-20221207165436-fuzzing-debug/firefox-bin+0x5b308) (BuildId: 31ccb93dee8e541e1ea154db589a683108f90298)

Unable to reproduce bug 1804794 using build mozilla-central 20221207165436-8e09abeeb445. Without a baseline, bugmon is unable to analyze this bug.
Removing bugmon keyword as no further action possible. Please review the bug and re-add the keyword for further analysis.

The severity field is not set for this bug.
:jfkthame, could you have a look please?

For more information, please visit auto_nag documentation.

I can reproduce the fatal assertion-failure in an up-to-date debug build.

S3 since this assertion probably indicates an edge-casey correctness issue and probably wouldn't trigger user-facing trouble; but hopefully something AlaskanEmily can sort out as part of fixing the final page-name related issues.

Looking deeper into this, I think we can roll this into the same fix we have planned for not triggering named page page-breaks inside floats. There are some subtrees for which we shouldn't break, and this is a specific case of that.
I'm working on a combined fix.

This currently only includes block frames, grid containers, and flex
containers, and the document and pagination frames. It is possible more frames
will need to be added or more advanced checks in the future.

Backed out for causing build bustages at ReflowInput.cpp.

Backout link: https://hg.mozilla.org/integration/autoland/rev/52d579edde48e501e3f851830874938f81f0e23a

Push with failures: https://treeherder.mozilla.org/jobs?repo=autoland&resultStatus=testfailed%2Cbusted%2Cexception%2Cretry%2Cusercancel&revision=70a0f82267f1fbbbb46a5b4c9f69a0e33d8874ac&selectedTaskRun=Ux6S3eJ-TJGZSJ01ILK-sA.0

Failure log: https://treeherder.mozilla.org/logviewer?job_id=406485484&repo=autoland&lineNumber=42534

It looks like an issue with includes + unified build order.

Yeah, specifically, ReflowInput.cpp needs an #include "mozilla/StaticPrefs_layout.h".

Yeah, I did that, just waiting on Lando.

https://hg.mozilla.org/mozilla-central/rev/24fedc3828e4

The patch landed in nightly and beta is affected.
:alaskanemily, is this bug important enough to require an uplift?

• If yes, please nominate the patch for beta approval.
• If no, please set status-firefox111 to wontfix.

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