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90bbf4505c
When comparing a Maybe<WrScrollId> to another WrScrollId we need to properly
handle the case where Nothing() signifies the root scroll frame. This is
equivalent to calling scrollId.valueOr(FrameMetrics::NULL_SCROLL_ID), as was
done before WrScrolLId replaced ViewId in the WebRender ScrollingLayersHelper.
We also have DisplayListBuilder::TopmostScrollId always return a value instead
of a Maybe, since an empty clip stack means that the current scroll id is that
of the root scroll frame.
Previously Nothing() was not equivalent to WrScrollId { 0 }, which caused the
ScrollingLayersHelper to fill the mClipAndScroll value and push another
set of clip and scroll nodes onto the WebRender display list builder.
MozReview-Commit-ID: CeatZlRXtuI
27 lines
417 B
HTML
27 lines
417 B
HTML
<!DOCTYPE html>
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<html>
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<head>
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<style>
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#header {
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position: fixed;
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}
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#green {
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position: absolute;
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background: green;
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border-radius: 1px;
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transform: translateX(100px);
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}
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#text {
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visibility: hidden;
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}
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</style>
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</head>
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<body>
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<div id="header">
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<div id="green"><span id="text">Text.</span></div>
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</div>
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</body>
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</html>
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