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fix(tui): make ctrl+b reachable in subagent views - #53892
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Subagent views keep the composer open, which switches the keymap to composer mode. session.background was only bound in base mode, so the hint showed but ctrl+b did nothing. Bind it in composer mode too.
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In a subagent view, when the subagent is running a long shell command, the TUI shows "Press ctrl+b to move running work to the background", but pressing it does nothing.
Why
Subagent views keep the composer (subagent picker) open, which pushes the
composerkeymap mode.session.backgroundwas only bound in the base-mode layer, so ctrl+b was unreachable. The hint reads registered shortcuts, so it still rendered.Change
Also bind
session.backgroundincomposermode. The command still targets the viewed session, so in a subagent view it backgrounds the subagent's own blocking shell. Whether the subagent itself is foreground or background doesn't matter.Testing
Verified with
opencode-driveand a simulated LLM. A foregroundgeneralsubagent runs a real 12-second shell loop. Open the subagent (down + enter), wait for the hint, press ctrl+b.origin/v2: the hint stays visible and the shell keeps running in the foreground until it completes.Background, the hint disappears, and the subagent continues with its next response. The parent stays blocked on the subagent until it finishes.Also ran
bun run typecheckinpackages/tui.Requested by: @nexxeln (nexxel via Slack)