-- v2: winex11: Use the new helper to set COMPOSITIONSTRING text. winex11: Use EM_REPLACESEL to set IME composition strings. winex11: Always zero terminate XIM composition string. winex11: Compute preedit text buffer sizes in WCHAR units. winex11: Use an IME UI message to set composition status. winex11: Use an IME UI message to set cursor pos. winex11: Use an IME UI message to get cursor pos. winex11: Use an IME UI message to set open status. win32u: Keep the IME UI window in win32u struct imc.