wxSTC: IME pre-edit text not displayed on Linux and probably Mac too (Issue #26228)

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filip-hejsek

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Feb 23, 2026, 5:13:53 AM (3 days ago) Feb 23

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filip-hejsek created an issue (wxWidgets/wxWidgets#26228)

Description

Bug description:

IME pre-edit text is not displayed. This seems to be caused by missing IME implementation in src/stc/ScintillaWX.cpp

Expected vs observed behaviour:

Expected: when using IME, pre-edit text is displayed inline (with underline style)
Actual: pre-edit text is not visible anywhere

To Reproduce:

Run stctest sample
Use IME

Platform and version information

wxWidgets version: master (11e5cae)
wxWidgets port: wxGTK
OS: Arch Linux
- GTK version: 3.24.51
- GDK backend: Wayland
- Desktop environment: GNOME

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arch1t3cht

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Feb 23, 2026, 4:35:05 PM (2 days ago) Feb 23

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arch1t3cht left a comment (wxWidgets/wxWidgets#26228)

and probably Mac too

I can confirm that the IME is also broken on Mac: No characters show up when typing. Once I stop typing, the suggestions window appears in the bottom right of the screen, but clicking a suggestion does not make it appear in the STC control. (At least not immediately, it sometimes appears after I press Enter or some arrow keys a few more times.)

FWIW, Aegisub (a downstream application using wxSTC) used to have a hack TypesettingTools/Aegisub@fffb138 to fix IME support on Mac by injecting some code using private wxWidgets symbols into the wxSTC. I don't yet understand this code, but I tested it against wxWidgets master and can confirm that it fixes the IME there. So I'm linking it here in case it helps.