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Bug 1321284 - Crash in nsCSSFrameConstructor::GetInsertionPrevSibling when trying to reframe native anonymous content

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* Make StyleChildrenIterator skip NAC generated by root element primary frame ancestors.
* Add nsINode::GetFlattenedTreeParentNodeForStyle.
* Add iterator class to find all restyle roots.

NOTE: Parts 1, 2, and "4.2"

Tag #1375
This commit is contained in:
Matt A. Tobin 2020-04-14 21:50:13 -04:00 • committed by Roy Tam
commit a03838af22
14 changed files with 226 additions and 35 deletions
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16
dom/base/ChildIterator.cpp
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@ -383,12 +383,10 @@ AllChildrenIterator::AppendNativeAnonymousChildren()
// The root scroll frame is not the primary frame of the root element.
// Detect and handle this case.
if (mOriginalContent == mOriginalContent->OwnerDoc()->GetRootElement()) {
nsIPresShell* presShell = mOriginalContent->OwnerDoc()->GetShell();
nsIFrame* scrollFrame = presShell ? presShell->GetRootScrollFrame() : nullptr;
if (scrollFrame) {
AppendNativeAnonymousChildrenFromFrame(scrollFrame);
}
if (!(mFlags & nsIContent::eSkipDocumentLevelNativeAnonymousContent) &&
mOriginalContent == mOriginalContent->OwnerDoc()->GetRootElement()) {
nsContentUtils::AppendDocumentLevelNativeAnonymousContentTo(
mOriginalContent->OwnerDoc(), mAnonKids);
}
}
@ -585,12 +583,6 @@ StyleChildrenIterator::IsNeeded(const Element* aElement)
return true;
}
// The root element has a scroll frame that is not the primary frame, so we
// need to do special checking for that case.
if (aElement == aElement->OwnerDoc()->GetRootElement()) {
return true;
}
return false;
}