[vim/vim] Changing 'isprint' breaks drawing of unrelated Unicode characters (Issue #21053)
Emilien Breton
Bricktech2000 created an issue (vim/vim#21053)Steps to reproduce
vim -u NONE -i NONE then insert U+222B INTEGRAL into the buffer (i<c-v>u222b<esc>). Now run :se isp+=^226 and the integral character turns into a less-than sign. :se isp& and the integral is back.
With a number other than 226 the integral looks fine. The UTF-8 encoding of U+222B is e2 88 ab, and 226 is decimal for hex e2. It's almost like one part of Vim only looks at the first UTF-8 byte and thinks the character is non-printable and tries to display <222b> while another part of Vim correctly considers it printable and only allots one cell for the character and truncates <222b> to <.
Version of Vim
9.1.1566
Environment
NixOS 25.05, 'encoding' is UTF-8
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