[Bug 158105] New: Task Manager icon appearing at top left corner when closing window

[diafero at arcor.de]

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http://bugs.kde.org/show_bug.cgi?id=158105         
           Summary: Task Manager icon appearing at top left corner when
                    closing window
           Product: plasma
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: panel-devel kde org
        ReportedBy: diafero arcor de


Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          gcc (GCC) 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2) 
OS:                Linux

When I close a window with an entry in the task manager in the panel, it's entry disappears immediately from the panel, but for a short time (~0,5 seconds) it's visible at the top-left corner before it completely disappears.