The previous `attachCustomWheelEventHandler(() => false)` killed scrolling
outright. xterm's `bindMouse` consults that handler in BOTH wheel paths — the
one that emits a real SGR mouse report and the fallback that turns a notch on
an alt-screen buffer into ESC[A/ESC[B — so a blanket false also blocked tmux's
own wheel scrolling (tmux runs with `mouse on`, i.e. tracking is active).
Now the handler returns false only for the exact bad case: no wheel tracking
AND an alternate buffer. `x10` counts as untracked because that protocol
reports button presses only, never the wheel, so xterm takes the emulation
path for it too.
xterm emits ESC[Z for Shift+Tab but, unlike plain Tab, never marks the
keyboard event cancelled, so the browser ran its default action and moved
focus out of the terminal. The pane saw only the first press, which made
`shift+tab to cycle` (claude's permission mode) look dead on /run while
working fine in a real terminal.
A custom key handler now calls preventDefault() on that one combo and still
returns true, so xterm's own handling — including the ESC[Z it sends — is
untouched; only the focus-moving default is suppressed. Verified against a
scratch tmux session: writing ESC[Z into the attach pty cycles claude's
status line from `bypass permissions on` to `auto mode on`.
Trade-off: Shift+Tab no longer tab-reverses out of the terminal; click
elsewhere to move focus.
Three separate reasons the Workspace terminal looked unscrollable:
- xterm falls back, on an alt-screen buffer whose program has not enabled
mouse tracking, to translating each wheel notch into a cursor-key press.
Inside a `claude` pane that reads as arrow up/down, so scrolling walked the
prompt history. A custom wheel handler returning false suppresses only that
emulation branch; real mouse reports come from a separate listener xterm
registers when the program does request wheel events.
- TerminalView never reconnected, so a server restart left the pane frozen on
its last painted frame — still live-looking, but swallowing every keystroke
and mouse report. It now re-attaches 1.5s after an unexpected close and
stops only on the server's `exit` frame; tmux keeps the session, so the
re-attach repaints in full.
- tmux repaints the whole pane, so xterm's own scrollback is always empty and
its viewport scrollbar renders as a groove with no thumb that cannot move.
Hidden, since scrolling there goes through mouse reports, not the DOM.
Server streams PTY output as binary WS frames, but the browser's default
binaryType ("blob") handed onmessage a Blob that never matched the
`typeof === "string"` check — every keystroke response was silently
dropped and the terminal stayed blank despite the backend streaming
correctly (verified via a raw ws client against the live tmux session).
`npm run test:client` (Vitest/esbuild) doesn't type-check, so several
tasks' incomplete cleanup of the old RunConsole-era code in
Workspace.tsx (SlashCommand/BUILTIN_SLASH_COMMANDS references, old
RunStatus values, a stray `mode` field, a wrong `prompt` vs
`initialPrompt` key) went unnoticed through every review until `tsc
--noEmit` was run directly. Also fixes a stale `RunStatusPayload.exitCode`
read in Tabby's brain.ts and dangling RunStreamPayload/RunInputAckPayload
references left in types.ts.
nntrivi2001