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Three things the terminal was getting wrong. **A program that grabs the mouse and dies used to freeze the tab.** A TUI sets DECSET ?1000/?1002/?1003; if it exits without resetting them, xterm keeps routing clicks, drags and — under ?1003 — every pointer *move* to the PTY. Text selection dies and escape bytes flood the prompt. The only exit was closing the tab. `TerminalView` now reconciles a flag against `term.modes.mouseTrackingMode` in the `term.write()` callback — the mode only changes because the container printed a sequence, so one check per write catches every transition with no polling — and `Ctrl+Shift+X` or a status-bar button writes the resets back through `term.write`, never `sendInput`: the reset belongs to xterm's parser, and a still-live TUI told about it would just re-grab on its next repaint. The control is in the status bar deliberately. Mouse tracking is the *normal* state of htop, vim, lazygit and Claude Code, so a badge over the terminal would be on screen for the whole life of those programs and would swallow clicks aimed at their own top-right corner. `macOptionClickForcesSelection` is also on now: xterm's force-select is Shift everywhere except macOS, where it is Option and is gated behind that option, which defaults to false — so until now Mac users had no way to select text while a program held the mouse. **"Following" and "Jump to Current" are gone.** Claude Code draws on the alternate screen, which has no scrollback, so `viewportY` always equalled `baseY` and neither control could do anything. They did still work in bash tabs; xterm's native follow covers that, and the per-write `scrollToBottom()` went with them because it fought exactly that. What remains, on activate and after a refit, now samples `viewportY >= baseY` *before* the fit, so opening the Notes dock no longer yanks a reader to the tail. **`claude update` runs before every Claude session, not just at container start.** Containers here stop/start and often just keep running, so a long-lived one never re-checked. Both copies take the same flock: the entrypoint prints "container ready" only after its own update finishes, so opening a tab immediately would otherwise run two updaters against the same ~/.claude/bin, with `|| echo` hiding a half-written install one line before `exec claude` ran it. This turns the non-Bedrock path from a bare argv into a `bash -c` wrapper, so flags and session names are shell-interpolated now and must go through `shell_quote_arg`. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0145mQi9NZiCDrznBUEEDE4n