Fullscreen TUI renderer opens hyperlinks twice on click

Summary

In the fullscreen TUI renderer, clicking an OSC-8 hyperlink in the terminal opens the URL twice (two browser tabs). Switching to the default renderer (/tui default) opens it once, as expected.

Repro

1. /tui fullscreen
2. Have Claude output any clickable hyperlink (e.g. a URL in a response).
3. Single left-click the link.
4. → Browser opens two tabs for the same URL.
5. /tui default, click the same link → opens one tab.

Expected

One click → one open, regardless of renderer.

Diagnosis

Ruled out the OS/handler layer: gio open <url> opens one tab, and clicking under the default renderer opens one tab. xdg-mime query default x-scheme-handler/https shows a single handler. The double-open only occurs under the fullscreen renderer, so it appears the fullscreen renderer double-emits the OSC-8 hyperlink escape (or double-registers the click region).

Environment

• Claude Code: 2.1.205
• OS: Ubuntu 26.04 LTS (GNOME)
• Terminal: VTE-based (VTE_VERSION=8400), TERM=xterm-256color

Workaround

Use /tui default.