NEW 210216
Generate event region for every root layer 
https://bugs.webkit.org/show_bug.cgi?id=210216
Summary Generate event region for every root layer
Daniel Bates
Reported 2020-04-08 15:19:39 PDT
RenderLayer::invalidateEventRegion() and RenderLayerBacking::updateEventRegion() only generate an event region for non-root layers so the UI process has more info for hit testing.
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Daniel Bates
Comment 1 2020-04-08 15:22:13 PDT
This bug came up while considering alt patch attachment #395855 [details] (bug 210041). It removed an iOS compile-time guard from RenderLayer::invalidateEventRegion(), which made causes this progression: [[ --- /Volumes/Data/worker/macOS-Mojave-Release-WK2-Tests-EWS/build/layout-test-results/fast/scrolling/mac/event-region-subframe-expected.txt +++ /Volumes/Data/worker/macOS-Mojave-Release-WK2-Tests-EWS/build/layout-test-results/fast/scrolling/mac/event-region-subframe-actual.txt @@ -6,6 +6,9 @@ (GraphicsLayer (bounds 800.00 600.00) (contentsOpaque 1) + (event region + (rect (0,0) width=800 height=600) + ) (children 1 (GraphicsLayer (position 8.00 8.00) ]]
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