[Bug 59740] New: Programs running under Wayland do not notice when they lose focus

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59740

            Bug ID: 59740
           Summary: Programs running under Wayland do not notice when they
                    lose focus
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: winewayland
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

When running under X11, programs can use `GetForegroundWindow()` to detect if
they have focus or not. This gets updated as part of `X11DRV_FocusIn()` and
`focus_out()` (which is called by `X11DRV_FocusOut()`.

The X11 code works by setting the foreground window to the desktop when this
happens:

        /* Abey : 6-Oct-99. Check again if the focus out window is the
           Foreground window, because in most cases the messages sent
           above must have already changed the foreground window, in which
           case we don't have to change the foreground window to 0 */
        if (hwnd == NtUserGetForegroundWindow())
        {
            TRACE( "lost focus, setting fg to desktop\n" );
            NtUserSetForegroundWindowInternal( NtUserGetDesktopWindow() );
        }

The Wayland driver has no such check, and as a result programs don't notice
they are not the foreground window any more. Instead, the function
`keyboard_handle_leave()` has this comment:

    /* FIXME: update foreground window as well */

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