[Webkit-unassigned] [Bug 210216] Generate event region for every root layer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210216

--- Comment #1 from Daniel Bates <dbates at webkit.org> ---
This bug came up while considering alt patch attachment #395855 (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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