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remote-tmux: close a window emptied by gathering its mirrors into a new one - #17141
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…d --new-window A dedicated attach moves the host's existing mirrors into the new window. A source window that held only those mirrors is emptied, recovers by opening a fresh local shell, and stays on screen.
…ew one A dedicated attach moves the host's existing mirrors into the new window. A source window that held only those mirrors was emptied, recovered by opening a fresh local shell, and stayed on screen as a blank window. It is now closed. A window with workspaces of its own is left as it was.
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📝 WalkthroughWalkthroughWhen ChangesRemote tmux mirror moves
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to Attaching with --new-window can close a source window that still has Dock terminals or browsers, and the Dock work in it is lost. Add a Dock-empty guard before merging. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The cleanup can close a source window that still contains live terminal or browser panels outside its moved workspaces, without the usual close warning or closed-window history. The effect is bounded to source windows involved in an explicitly requested mirror consolidation. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 error)
✅ Passed checks (24 passed)
Full details: Cmux Algorithmic ComplexityExplanation The new close path adds per-source-window scans. In Resolution Avoid scanning all window contexts once per emptied source manager. Resolve window IDs from an existing manager-to-window index or build a manager/window lookup once before the batch, then reuse it for closing the emptied windows. Ensure the close operation also uses an indexed window-ID lookup instead of rescanning all contexts per target. ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
Review comments at @Sources/RemoteTmuxController+Attach.swift:
- Line 202: Update the `holdsOnlyTheseMirrors` window-discard guard to preserve
the source window whenever its existing Dock has panels; discard it only when
the Dock is absent or empty. Add a regression case covering mirror-only tabs
with an occupied Dock.
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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00f182f Set Claude idle after reentrant stop without work (manaflow-ai#16635) d8ef7e7 Reject unknown and valueless options in cmux hooks setup (manaflow-ai#17183) 46b5f9c remote-tmux: let a failed socket request say what failed (manaflow-ai#17134) e88d636 remote-tmux: re-read a pane from tmux when its width changes, not only when it grows (manaflow-ai#17140) 984baea remote-tmux: close a window emptied by gathering its mirrors into a new one (manaflow-ai#17141) 9c41d59 fix: recover hidden terminal renderer after window attach (manaflow-ai#16548) 70854a5 ci: publish dogfood artifacts from red CI runs (manaflow-ai#17210) db77e58 fix(cli): reject missing notify text values (manaflow-ai#16778) 76ccbfc ci: activate org-member dogfood artifact publisher (manaflow-ai#17206)
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Summary
Run
cmux ssh-tmux <host> --new-windowtwice and you end up with two new windows: the second one holding the mirrors, and the first one showing a fresh local shell.A dedicated attach moves the host's existing mirrors into the window it creates. The window they came from is left with no workspaces, and
detachWorkspacerecovers an empty window by opening a local one. A window that held nothing but those mirrors is now closed once they have moved. A window with workspaces of its own keeps them and gains nothing.#7992 fixed the same blank window for an explicit detach.
Testing
Two tests in
RemoteTmuxMirrorCloseDetachTests, run withxcodebuild test-without-building -scheme cmux-unit -only-testing:cmuxTests/RemoteTmuxMirrorCloseDetachTests:consolidatingMirrorsClosesAWindowThatHeldNothingElsefails, the emptied window is still listed.consolidatingMirrorsLeavesAWindowWithOtherWorkspacesAlonepasses before and after.RemoteTmuxMirrorDedicatedPlacementTests,RemoteTmuxAuthTestsandRemoteTmuxPaneSeedTransportTests(74 tests in 4 suites).main at 68bb2f1 does not compile its test target:
RightSidebarTabCustomizationTestsandCloudMachineOrderingTestsfail to build. Both runs left those two files out locally. That change is not in this branch.Against a live tmux server, on a local build that carries this change on top of other branches of mine: two
--new-windowattaches in a row left two new windows before and one after.Changelog
Fixed: Running
cmux ssh-tmux --new-windowagain for a host no longer leaves a blank window behind.Checklist
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@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
Fixes a blank window left behind by a second
cmux ssh-tmux --new-windowattach.A dedicated attach moves a host's existing mirrors into the new window it creates. The source window, if it held only those mirrors, was emptied and then recovered by opening a fresh local shell, leaving a blank window on screen. Such a window is now closed once its mirrors move out; a window with workspaces of its own keeps them and is unaffected.
Bug Fixes
Sources/RemoteTmuxController+Attach.swiftnow closes a source window emptied by a mirror-moving attach.RemoteTmuxMirrorCloseDetachTestscovering the emptied window and the window with other workspaces.Written for commit d42870f. Summary will update on new commits.
Summary by CodeRabbit