[Bug 57474] New: Windows disappear irreversibly when are not shown on a virtual desktop

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57474

Bug ID: 57474
           Summary: Windows disappear irreversibly when are not shown on a
                    virtual desktop
           Product: Wine
           Version: 9.22
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: winex11.drv
          Assignee: [e-mail]
          Reporter: [e-mail]
                CC: [e-mail]
      Distribution: ---

Created attachment 77482
  --> https://bugs.winehq.org/attachment.cgi?id=77482
Log of WINEDEBUG=+x11drv,+event wine notepad 2>&1

With the introduction of new window handling functions in window.c since 9.21
Wine is unusable in virtual desktop configurations. I use a virtual desktop 2
rows by 3 columns in FVWM, and, as a window is no more shown because it is not
on an active page, it is unmapped and disappears from the list of active
windows in FVWM, and there is no way to get it back.

Steps to reproduce: start FVWM with a virtual desktop with >1 page, start "wine
notepad", move to another page and then back. The notepad.exe window is not
shown both on the screen and in the window list, although the program is
running.

Log of

WINEDEBUG=+x11drv,+event wine notepad 2>&1

is attached.