[webkit-changes] [WebKit/WebKit] 10ed5c: REGRESSION(264622): some InteractionRegion occlusi...

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  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 10ed5ca647f0b6e07cdf5d8c9715503ba4648e45
      https://github.com/WebKit/WebKit/commit/10ed5ca647f0b6e07cdf5d8c9715503ba4648e45
  Author: Etienne Segonzac <sgz at apple.com>
  Date:   2023-06-14 (Wed, 14 Jun 2023)

  Changed paths:
    M LayoutTests/interaction-region/full-page-overlay-expected.txt
    M LayoutTests/interaction-region/full-page-overlay.html
    M Source/WebCore/rendering/RenderLayerBacking.cpp

  Log Message:
  -----------
  REGRESSION(264622): some InteractionRegion occlusion layers are missing
https://bugs.webkit.org/show_bug.cgi?id=257952
<rdar://110631042>

Reviewed by Simon Fraser.

Only clear InteractionRegions when the RenderLayerBacking stops
requiring its own backing.

* Source/WebCore/rendering/RenderLayerBacking.cpp:
(WebCore::RenderLayerBacking::updateDrawsContent):
Remove the previous `clearInteractionRegions()` call.
(WebCore::RenderLayerBacking::clearInteractionRegions):
Early return when the EventRegion has no InteractionRegion.
(WebCore::RenderLayerBacking::setRequiresOwnBackingStore):
Clear InteractionRegions when `requiresOwnBaking` turns false.

* LayoutTests/interaction-region/full-page-overlay-expected.txt:
* LayoutTests/interaction-region/full-page-overlay.html:
Update test to cover the regression.

Canonical link: https://commits.webkit.org/265160@main