This patch fixes a Japanese input issue in MS Office Visual Basic and Mery text
editor ime inline mode. The following was considered:
1. Japanese ime: the result string message is always placed between
WM_IME_STARTCOMPOSITION and WM_IME_ENDCOMPOSITION. Currently in Wine,
the result string message follows WM_IME_ENDCOMPOSITION.
dlls/imm32/tests/imm32.c::test_nihongo_no().
2. Chinese ime: same as Japanese ime.
3. Korean ime: mostly the same, but there are some cases where it is not
(e.g. CPS_COMPLETE, 'r-k-RETURN'). However, I haven't found any problem
even if it behave like Japanese ime message order.
3. zero-length preedit string: as in MR !3115 commit d1f9aae, the message
followed by WM_IME_ENDCOMPOSITION. Currently in Wine, it is associated
with WM_IME_STARTCOMPOSITION.
4. zero-length result string: ignore.
--
v2: imm32: Fix the WM_IME_COMPOSITION messages to be between the WM_IME_{START|END}COMPOSITION message.
https://gitlab.winehq.org/wine/wine/-/merge_requests/7827
If CompAttr and CompClause are properly configured, Japanese input
will be more comfortable.
Inspired by cursor_begin and cursor_end from Wayland zwp_text_input_v3::
preedit_string, I extended the cursor_pos concept as follows:
cursor_pos = MAKELONG( cursor_begin, cursor_end );
ime_to_tascii_ex() uses this to construct CompAttr, CompClause.
MS Windows native CompAttr, CompClause is a bit more complicated
than this, but the concept is useful enough.
It requires additional implementation in the Wine ime_ui_window proc and
richedit control. However, it is useful for applications that inline ime
composition string.
This can be tested with MS Office Word, Excel. LANG=ja_JP.UTF-8 wine EXCEL.EXE
Test key sequences:
- “n-i-h-o-n-g-o-n-o-m-o-j-i-d-e-s-u-.-SPACE”.
- And, RIGHT, LEFT, Shift+LEFT, Shift+RIGHT, ESC, SPACE, etc.
--
v4: winex11: Update only when caret pos changed in xic_preedit_caret.
winex11: Extend cursor_pos using cursor_begin, cursor_end.
winemac: Extend cursor_pos using cursor_begin, cursor_end.
winewayland: Extend cursor_pos using cursor_begin, cursor_end.
win32u: Add more CompAttr, CompClause implementation using cursor_begin, cursor_end concept.
https://gitlab.winehq.org/wine/wine/-/merge_requests/7812