[Bug 251136] x11-wm/xfce4-wm: 4.14.6 fix crash on hang application kill via context menu

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251136

            Bug ID: 251136
           Summary: x11-wm/xfce4-wm: 4.14.6 fix crash on hang application
                    kill via context menu
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: xfce at FreeBSD.org
          Reporter: rozhuk.im at gmail.com
             Flags: maintainer-feedback?(xfce at FreeBSD.org)
          Assignee: xfce at FreeBSD.org

Created attachment 219680
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=219680&action=edit
patch

If I try to kill/end hanged app via context menu then after app die xfwm4 core
dumps:

/usr/local/bin/xfwm4 --display unix:0.0 --sm-client-id
2d88326ee-d7fc-11e5-8d34-6cf0497538e3 --replace
Waiting for current window manager (Xfwm4) on screen unix:0.0 to exit: Done

(xfwm4:9573): Gdk-ERROR **: 17:39:45.446: The program 'xfwm4' received an X
Window System error.
This probably reflects a bug in the program.
The error was 'BadValue (integer parameter out of range for operation)'.
  (Details: serial 78074 error_code 2 request_code 113 (core protocol)
minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
Trace/BPT trap (core dumped)

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