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ScrollFrameHelper::DecideScrollableLayer doesn't get the actual value of usingDisplayPort/wasUsingDisplayPort if we are not painting to the window. It then sets mWillBuildScrollableLayer to usingDisplayPort. mWillBuildScrollableLayer is the value that determines if we are active and hence an ASR, we don't want to change that between paint display lists for an event handling display list. We then want to condition uses of mWillBuildScrollableLayer and the return value of DecideScrollableLayer on if we want painting to the window so we get the same behaviour as before when not painting to the window. |
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