Safari: First character after Caps Lock and long-press auto-repeat are dropped in xterm.js

[longshuaige]

Details

When running xterm.js inside a React app on Safari (macOS), toggling Caps Lock or long-pressing any printable key causes the first character (or repeated characters) to be swallowed. Native <textarea> elements on the same page keep working, so the regression is specific to xterm’s hidden textarea + input pipeline.

Steps to reproduce

Click inside the terminal to focus it.

Press Caps Lock, then type any letter once.

Long-press a letter key (e.g., “a”) to trigger Safari’s auto-repeat.

Environment

xterm.js: 5.5.0 (@xterm/xterm@5.5.0)

Browser: Safari 17.2 on macOS Sonoma 14.2 (also reproducible on Safari 16.x / macOS Ventura)

Framework: React 18 + Vite (see src/App.jsx in the attached sample repo)

[Tyriar]

Can you try on xterm.js v6?

[longshuaige]

Just confirmed, the issue is still there. sougou