[Bug 29560] New: RagTime 5.6.5 installer does not respond to mouseclicks properly

http://bugs.winehq.org/show_bug.cgi?id=29560

Bug #: 29560
           Summary: RagTime 5.6.5 installer does not respond to
                    mouseclicks properly
           Product: Wine
           Version: 1.2.3
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

While testing bug 15427, I noticed that the installer's buttons don't respond
to mouse clicks unless you alt-tab away and back, or run in a virtual desktop.
It responds to keystrokes and autohotkey ControlClick commands just fine,
though.
Problem was seen in every version of wine tested: 1.2.3, 1.3.14, 1.3.15,
1.3.28, git.

(Bug 26374 was for the same installer, might indicate it handles messages
in an unusual manner?)