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layout: Rewrite the block formatting context/float inline-size
speculation code. The old code tried to do the speculation as a single bottom-up pass after intrinsic inline-size calculation, which was unable to handle cases like this: <div> <div style="float: left">Foo</div> </div> <div> <div style="overflow: hidden">Bar</div> </div> No single bottom-up pass could possibly handle this case, because the inline-size of the float flowing out of the "Foo" block could never make it down to the "Bar" block, where it is needed for speculation. On the pages I tried, this regresses layout performance by 1%-2%. I first noticed this breaking some pages, like the Google SERPs, several months ago.
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@ -49,6 +49,7 @@ pub enum ProfilerCategory {
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LayoutDamagePropagate,
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LayoutGeneratedContent,
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LayoutDisplayListSorting,
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LayoutFloatPlacementSpeculation,
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LayoutMain,
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LayoutStoreOverflow,
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LayoutParallelWarmup,
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