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Do not interpret CSI ? u as DECRC (#181)

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The kitty keyboard protocol docs recommend CSI ? u to query support for
that protocol, see https://sw.kovidgoyal.net/kitty/keyboard-protocol/

For better or worse, fish shell uses this query to work around bugs
in other terminals triggered by requesting that protocol via CSI = 5 u.

Unfortunately, st interprets CSI ? u as DECRC (restore cursor
position). reproduce with 'printf "\x1b[?u"; cat'.

fish could work around this by switching to the alternate screen
before running this query; but that might cause tearing on terminals
that don't support Synchronized Output. I'm not sure.

In the meantime, let's correct our parser.

This adds a redundant else-after-return, for consistency with the
surrounding code.

ref. https://git.suckless.org/st/commit/98610fcd37f655d44586323dc86c1d013c2798ce.html

Signed-off-by: Laurent Cheylus <foxy@free.fr>
This commit is contained in:
Laurent Cheylus 2025-07-09 09:45:24 +02:00 • committed by Antoine Vaure
parent ad3c3e774c
commit 51d32a9a77
1 changed files with 5 additions and 1 deletions
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st.c
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@ -2524,7 +2524,11 @@ csihandle(void)
break;
#endif // CSI_22_23_PATCH | SIXEL_PATCH
case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
if (csiescseq.priv) {
goto unknown;
} else {
tcursor(CURSOR_LOAD);
}
break;
case ' ':
switch (csiescseq.mode[1]) {