Bug 217806

Summary: RenderStyle::diff() can return Equal when eventListenerRegionTypes() differ
Product: WebKit Reporter: Simon Fraser (smfr) <simon.fraser>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: bfulgham, koivisto, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: Safari Technology Preview   
Hardware: Unspecified   
OS: Unspecified   

Description Simon Fraser (smfr) 2020-10-15 20:34:29 PDT 
RenderStyle::diff() doesn't consult eventListenerRegionTypes(), so if we every early-return on Equal, we may have bugs.

We probably need a new StyleDiff value for this.
Comment 1 Simon Fraser (smfr) 2020-10-15 20:35:12 PDT 
For example RenderElement::styleWillChange() needs to hit layer->invalidateEventRegion().
Comment 2 Radar WebKit Bug Importer 2020-10-22 20:35:18 PDT 
<rdar://problem/70601723>