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Issue #1641 - Implement CSS flow-root keyword

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This is just a clean port of 1322191 and follow-up 1325970. It really seems to add create a new way to access existing code relating to block formatting and floating elements rather than implementing new functionality, and it is mercifully straightforwards.
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athenian200 2020-09-03 18:55:28 -05:00 • committed by Roy Tam
commit 9532970df5
15 changed files with 68 additions and 16 deletions
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7
layout/generic/nsBlockFrame.cpp
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@ -305,7 +305,7 @@ NS_NewBlockFormattingContext(nsIPresShell* aPresShell,
nsStyleContext* aStyleContext)
{
nsBlockFrame* blockFrame = NS_NewBlockFrame(aPresShell, aStyleContext);
blockFrame->AddStateBits(NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT);
blockFrame->AddStateBits(NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS);
return blockFrame;
}
@ -6893,10 +6893,11 @@ nsBlockFrame::Init(nsIContent* aContent,
// (http://dev.w3.org/csswg/css-writing-modes/#block-flow)
// If the box has contain: paint (or contain: strict), then it should also
// establish a formatting context.
if ((GetParent() && StyleVisibility()->mWritingMode !=
if (StyleDisplay()->mDisplay == mozilla::StyleDisplay::FlowRoot ||
(GetParent() && StyleVisibility()->mWritingMode !=
GetParent()->StyleVisibility()->mWritingMode) ||
StyleDisplay()->IsContainPaint()) {
AddStateBits(NS_BLOCK_FLOAT_MGR | NS_BLOCK_MARGIN_ROOT);
AddStateBits(NS_BLOCK_FORMATTING_CONTEXT_STATE_BITS);
}
if ((GetStateBits() &