[Webkit-unassigned] [Bug 113506] New: [Qt] Create ShadowBlur on demand.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=113506

           Summary: [Qt] Create ShadowBlur on demand.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: allan.jensen at digia.com


GraphicsContext for Qt keeps a single ShadowBlur object around and up to date. This leads to problems where an active ShadowBlur object can accidentially change its own values because it is disabling shadows on the parent graphics context (seen in the last patch in bug 90082 and in the patch for 111736).

We should instead like the other ports do, create the ShadowBlur object on demand when needed. This also means that the active ShadowBlur is its own object and doesn't get affected by changing shadow values on the GraphicsContext.

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