1. GCS_COMPSTR: XFilterEvent() True case, XIMPreeditDrawCallCallback() is invoked by XFilterEvent() internally. immediately processing. GCS_RESULTSTR: XFilterEvent() False case. X11DRV_XIMLookupChars() is invoked by KeyPress event handler. delayed processing. So, delayed event handler processing causes GCS_COMPSTR, GCS_RESULTSTR pair sequence inverting.
In Hangul IME, one key often generates GCS_COMPSTR, GCS_RESULTSTR pairs. The XIM server sends the correct order pair, but the message order inverted through the process_events(). Japanese input system can also produce similar situation.
2. Copying event variable does not guarantee complete state preservation. At the time of delayed processing, the global information that the event handler must refer to may be changed. Ex. XFilterEvent(), KeyPress event handler confirmed.
Signed-off-by: Byeongsik Jeon bsjeon@hanmail.net --- dlls/winex11.drv/event.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/dlls/winex11.drv/event.c b/dlls/winex11.drv/event.c index 170111e9c28..149069b0d29 100644 --- a/dlls/winex11.drv/event.c +++ b/dlls/winex11.drv/event.c @@ -445,6 +445,19 @@ static BOOL process_events( Display *display, Bool (*filter)(Display*, XEvent*,X else continue; /* filtered, ignore it */ } + if (event.type == KeyPress || event.type == KeyRelease) + { + if (prev_event.type) + { + queued |= call_event_handler( display, &prev_event ); + free_event_data( &prev_event ); + prev_event.type = 0; + action = MERGE_DISCARD; + } + queued |= call_event_handler( display, &event ); + continue; + } + get_event_data( &event ); if (prev_event.type) action = merge_events( &prev_event, &event ); switch( action )