[Webkit-unassigned] [Bug 36034] New: [Qt] GraphicsLayer: Opacity change from zero to non-zero doesn't always have effect with AC

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=36034

           Summary: [Qt] GraphicsLayer: Opacity change from zero to
                    non-zero doesn't always have effect with AC
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kim.gronholm at nomovok.com


Created an attachment (id=50541)
 --> (https://bugs.webkit.org/attachment.cgi?id=50541)
Opacity transition from 0 to 1 in 5s

When a web page has only an element which opacity is zero and the opacity is
changed to non-zero, the element doesn't become visible. If the mouse cursor is
moved outside the window area and back in, the element redraws with correct
opacity. After the element has been drawn once with non-zero opacity, the
subsequent opacity changes affect immediately. The bug doesn't occur without
AC.

Attached a test case to demonstrate the issue.

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