зеркало из https://github.com/mozilla/gecko-dev.git
d412b3daee
Previously displayport bases were computed as the intersection of the scrollport with the dirtyrect. However the dirtyrect covers what is rendered, and with displayports what we render can be much larger than what is visible. With displayport bases intended to represent what was visible, this was a problem. By restricting them to the root composition size this makes them more closely match what is visible. To do this more properly we'd want to intersect the dirtyrect with the scroll clip of every ancestor scroll frame, not just the root composition bounds. |
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