[Webkit-unassigned] [Bug 190229] New: Setting will-change transform needs to trigger at least z-order updates.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190229

            Bug ID: 190229
           Summary: Setting will-change transform needs to trigger at
                    least z-order updates.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Created attachment 351460

  --> https://bugs.webkit.org/attachment.cgi?id=351460&action=review

Testcase

When will-change changes, rareNonInheritedDataChangeRequiresLayout() sets a flag in changedContextSensitiveProperties, and then RenderStyle::changeRequiresLayerRepaint sees a z-index changes and says that repaint is required. Then RenderElement::adjustStyleDifference() takes the max of StyleDifference::RecompositeLayer and StyleDifference::Repaint and issues a repaint.

However, we need will-change to dirty z-order lists and and trigger compositing updates

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