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fix(terminal): support kitty keyboard protocol setting with "=" (#3942)

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From
https://sw.kovidgoyal.net/kitty/keyboard-protocol/#progressive-enhancement:

> The escape code for requesting enhancements is:

> CSI = flags ; mode u

That means it can be *set* with CSI =, not just pushed/popped onto the
stack with CSI < and CSI >.

This is important because otherwise zellij would interpret this as
restore_cursor_position, which would move the cursor.

This would be hit by the next fish-shell release, which sends CSI = 5
u and CSI = 0 u to enable/disable the kitty keyboard enhancements
unconditionally,
so if you used any program that saved the cursor position it would
constantly move your cursor back on every prompt.

Fixes #3852
This commit is contained in:
Fabian Boehm 2025-01-17 11:33:02 +01:00 • committed by GitHub
parent 9690783907
commit 0075548adc
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1 changed files with 11 additions and 0 deletions
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11
zellij-server/src/panes/grid.rs
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@ -2992,6 +2992,17 @@ impl Perform for Grid {
"\u{1b}[?0u"
};
self.pending_messages_to_pty.push(reply.as_bytes().to_vec());
} else if c == 'u' && intermediates == &[b'='] {
// kitty keyboard protocol without the stack, just setting.
// 0 disables, everything else enables.
let count = next_param_or(0);
if !self.explicitly_disable_kitty_keyboard_protocol {
if count > 0 {
self.supports_kitty_keyboard_protocol = true;
} else {
self.supports_kitty_keyboard_protocol = false;
}
}
} else if c == 'u' {
self.restore_cursor_position();
} else if c == '@' {