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fix(tui): ignore unsupported Kitty CSI-u modifiers closes #1807

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This commit is contained in:
Mario Zechner 2026-03-04 18:14:29 +01:00
parent 8e157412a6
commit 49749407fa
5 changed files with 25 additions and 1 deletions
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7
packages/tui/src/components/editor.ts
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@ -96,6 +96,8 @@ const KITTY_CSI_U_REGEX = /^\x1b\[(\d+)(?::(\d*))?(?::(\d+))?(?:;(\d+))?(?::(\d+
const KITTY_MOD_SHIFT = 1;
const KITTY_MOD_ALT = 2;
const KITTY_MOD_CTRL = 4;
const KITTY_LOCK_MASK = 64 + 128; // Caps Lock + Num Lock
const KITTY_ALLOWED_MODIFIERS = KITTY_MOD_SHIFT | KITTY_LOCK_MASK;
// Decode a printable CSI-u sequence, preferring the shifted key when present.
function decodeKittyPrintable(data: string): string | undefined {
@ -111,7 +113,10 @@ function decodeKittyPrintable(data: string): string | undefined {
// Modifiers are 1-indexed in CSI-u; normalize to our bitmask.
const modifier = Number.isFinite(modValue) ? modValue - 1 : 0;
// Ignore CSI-u sequences used for Alt/Ctrl shortcuts.
// Only accept printable CSI-u input for plain or Shift-modified text keys.
// Reject unsupported modifier bits (e.g. Super/Meta) to avoid inserting
// characters from modifier-only terminal events.
if ((modifier & ~KITTY_ALLOWED_MODIFIERS) !== 0) return undefined;
if (modifier & (KITTY_MOD_ALT | KITTY_MOD_CTRL)) return undefined;
// Prefer the shifted keycode when Shift is held.