New subject: [Bug 55849] Wine posts WM_(SYS)KEYUP message twice for Alt (and such) key if Fcitx/IBus daemon is running

31 Oct 2023


      https://bugs.winehq.org/show_bug.cgi?id=55849
Bug ID: 55849
           Summary: Wine sends WM_(SYS)KEYUP event twice for Alt (and
                    such) key if Fcitx/iBus daemon is running
           Product: Wine
           Version: 8.19
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winex11.drv
          Assignee: wine-bugs@winehq.org
          Reporter: emuser20140816@gmail.com
      Distribution: ---
Created attachment 75355
  --> https://bugs.winehq.org/attachment.cgi?id=75355
A test application
I've attached an example application that reproduces this issue
(win32-syskey-test.exe).
The expected behavior of this application is to toggle background color
(red/green) by pressing Alt (VK_MENU) key.
This application behaves correctly on Windows, and behaves correctly on Wine
too but only when the Fcitx/iBus daemon (with XIM integration enabled) is *not*
running:
  WM_SYSKEYDOWN: wParam: 18, lParam: 0x20380001
  WM_SYSKEYUP: wParam: 18, lParam: 0xc0380001
However, the application behaves differently on Wine if Fcitx/iBus daemon is
running:
  WM_SYSKEYDOWN: wParam: 18, lParam: 0x20380001
  WM_SYSKEYUP: wParam: 18, lParam: 0xc0380001
  WM_KEYUP: wParam: 18, lParam: 0xc0380001
and the toggle switch no longer works.
(This affects every application that takes a similar approach, i.e. an
application that uses Alt, Ctrl or Shift key to toggle something on
WM_(SYS)KEYUP event.)
The workaround for this issue is either quit the Fcitx/iBus daemon (which makes
IME unusable for this application) or revert the commit
https://gitlab.winehq.org/wine/wine/-/commit/a4a5a2ec121eeb2a7cd4ffbb5ba7b29...
(which requires complete rebuild from wine source tree).
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[Bug 55849] New: Wine sends WM_(SYS)KEYUP event twice for Alt (and such) key if Fcitx/iBus daemon is running