[Webkit-unassigned] [Bug 210311] New: Store event region on non-composited frames

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210311

            Bug ID: 210311
           Summary: Store event region on non-composited frames
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dbates at webkit.org
                CC: webkit-bug-importer at group.apple.com

I pushed the current design of event region past its limit in bug #210041 and this revealed bug #210278: updating event region for non-composited frames requires that the non-composited had layed out beforehand. The current design has compositing layers track and update an event region. Bug #210041 amended this design to have non-composited frames ask its enclosing compositing layer to do an event region paint that dives into (i.e. RenderWidget::paint() no longer bails out) the child that scheduled it. This opens up a situation where a compositing layer could try to dive into a child frame's content that didn't ask for an event region update as part of updating the composting layer's event region. I worked around this in bug #210278 with an added needsLayout() check in RenderWidget::paint(). The purpose of this bug is to remove that workaround.

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