[Bug 46180] New: wineserver does not unregister windows classes on process termination

https://bugs.winehq.org/show_bug.cgi?id=46180

Bug ID: 46180
           Summary: wineserver does not unregister windows classes on
                    process termination
           Product: Wine
           Version: 3.20
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: wineserver
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

According to
(https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-regi...),
Windows unregisters window classes registered by a process at process
termination, which is not implemented in wine and leads to resource leaks.

This can lead to an overflow of the global atom table in long running
processes, where wineserver is not restarted.

At this point
(https://github.com/wine-mirror/wine/blob/master/server/class.c#L159 and
https://github.com/wine-mirror/wine/blob/master/server/class.c#L166) an atom is
created or the Usage counter incremented, but when destroyed (
https://github.com/wine-mirror/wine/blob/master/server/class.c#L77), the
counter is not decremented, which would have to happen with a call to
release_global_atom().