There's only one use of usingDisplayPort left in ScrollFrameHelper::BuildDisplayList: https://dxr.mozilla.org/mozilla-central/rev/6020a4cb41a77a09484c24a5875bb221714c0e6a/layout/generic/nsGfxScrollFrame.cpp#2974 : > // If we are a root scroll frame that has a display port we want to add > // scrollbars, they will be children of the scrollable layer, but they get > // adjusted by the APZC automatically. > bool addScrollBars = mIsRoot && usingDisplayPort && !aBuilder->IsForEventDelivery(); I don't really understand what this condition wants to achieve. Why not add scrollbars always? I suppose we don't want them to swallow touch events on B2G/Android, but I don't understand the rest of the conditions.
We did this in bug 1405397. https://hg.mozilla.org/mozilla-central/rev/d6fdc1d3b070
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1405397
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