[Webkit-unassigned] [Bug 169943] New: When the browser window is activated or deactivated, images can flash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169943

            Bug ID: 169943
           Summary: When the browser window is activated or deactivated,
                    images can flash
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

We can get flashes of undecided images when the browser window goes between foreground and background.

This happens because tile size changes trigger painting, and we may have thrown away decoded data via the MemoryCache pruning timer, so we have to re-decode async and thus flash.

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