Enable kitty keyboard protocol for Shift+Enter distinction#71
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In a stock xterm.js terminal, Shift+Enter and Enter both send `\r`, so TUIs like Claude Code can't bind them differently and both submit. Upgrading @xterm/xterm to a 6.1.0 beta and opting into `vtExtensions.kittyKeyboard` lets the terminal advertise the kitty keyboard protocol; when the inner program negotiates it, modified keys round-trip as distinct CSI u sequences. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Adds a Supported CSI section covering CSI > q (iTerm2 device attributes), DECSET/DECRST observation for mouse/bracketed-paste mode, kitty keyboard protocol, and replay-time CSI reply filtering. The escape-sequence registry now covers both OSC and CSI so the fail-inertly rule has a single home. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
vtExtensions.kittyKeyboardso Shift+Enter is distinguishable from Enter@xterm/xtermand@xterm/addon-fitto beta builds (6.1.0-beta.216 / 0.12.0-beta.216) that expose the optionTest plan
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