[3.14] gh-153864: Fix curses window.insch() for non-ASCII characters on a wide build (GH-153865)#154152
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serhiy-storchaka merged 1 commit intoJul 19, 2026
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…cters on a wide build (pythonGH-153865) On a wide build, winsch() does not locale-decode a byte above 127, unlike waddch(), so insch()/mvinsch() stored the wrong character for a non-ASCII byte of an 8-bit locale ('€' 0xA4 under ISO-8859-15 became U+00A4 '¤'). Decode the byte with btowc() and insert it as a wide character, as addch() effectively does. (cherry picked from commit 223cbff) Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
This was referenced Jul 19, 2026
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Manual backport of #153865; the automatic backport hit a conflict.
3.14 predates the 3.15 error-handling refactor, so the wide-character path is written in 3.14's
addch()idiom:setcchar(..., PAIR_NUMBER(...), NULL)+wins_wch/mvwins_wch, returning throughPyCursesCheckERR_ForWin().Verified on a wide (
HAVE_NCURSESW) build:test_output_characterpasses underISO-8859-15where€(0xA4) exercises the fix, and the fulltest_cursesis green there.