[Webkit-unassigned] [Bug 208659] New: DisplayList::Save item should not track the index of the corresponding Restore item

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=208659

            Bug ID: 208659
           Summary: DisplayList::Save item should not track the index of
                    the corresponding Restore item
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Canvas
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: dino at apple.com

The restoreIndex was an opportunity of optimization. If all no drawing between the Save and Restore happens, this means these items are all void and can be deleted from the DisplayList. With the canvas drawing and with batching the DisplayList flushing, this causes a serious problem when we try to remove the items at and after currentState().saveItemIndex.

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