зеркало из https://github.com/mozilla/gecko-dev.git
4e61ce38ec
AppendScrollPartsTo finds or creates a scroll id for the current scroll frame if IsMaybeScrollingActive() is true (otherwise it uses the null scrollid). IsMaybeScrollingActive() looks at mShouldBuildScrollableLayer, which we compute after the first call to AppendScrollPartsTo in ScrollFrameHelper::BuildDisplayList. This means that on the first paint with a displayport set (or even if we create a displayport is ScrollFrameHelper::BuildDisplayList) we wouldn't layerize the scroll thumb in nsSliderFrame::BuildDisplayListForChildren because it looks for the current scroll id set on the display list builder. On subsequent paints this would be corrected so it caused reftest failures. |
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