[Bug 12418] New: parent window getting closed instead of a tool window

http://bugs.winehq.org/show_bug.cgi?id=12418

Summary: parent window getting closed instead of a tool window
           Product: Wine
           Version: CVS/GIT
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: source
          Severity: trivial
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

This is a follow up to bug 11026.

With the test case in attachment 10126, in KDE, if I press alt+F4, the parent
window gets closed instead of the tool window.

To reproduce:

1. start the test program from attachment 10126.
2. click on the button to bring up the tool window.
3. press alt+F4.

expected result: the tool window gets closed.
actual result: the parent window gets closed.