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Cloud: keep native split layouts by writing layout edits to the machine - #15786
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughCloud workspace projection now checks graph completeness before reconciling workspaces or closing panes. Layout projection validates placement mappings and restores a session-layout snapshot. Tests cover incomplete graphs, retained projections, and preservation of the existing pane tree. ChangesCloud workspace projection
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: Medium Suggested reviewers: Merge Risk: 🟡 Moderate · up to A tab moved between Cloud workspaces can disappear locally when the destination inventory is incomplete, potentially collapsing its source split. Preserve the source projection until the destination can reconcile before merging. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change narrows destructive actions when remote placement data is incomplete and preserves local layout ownership. No introduced security issue was established in the reviewed paths. Risk remains low rather than minimal because end-to-end identity controls and some failure-recovery behavior remain unverified, and the application-host regression was not executed. Retained concerns Security review detailsSecurity Blast Radius
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Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 error, 1 warning)
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Full details: Cmux Algorithmic ComplexityExplanation The diff adds an unbounded full graph scan to a hot Cloud socket path. Resolution Compute graph completeness once when the accepted Cloud publication is installed, cache it by the accepted state/resource publication or cursor, and pass the cached result to pane cleanup and workspace reconciliation. Invalidate the cache when that publication changes. Do not reconstruct ✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
🛠️ Fix failing CI checks 💡
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@Sources/Surfaces/SurfaceCatalog+CloudWorkspaceProjection.swift:
- Around line 40-54: Replace per-workspace checks in cloud reconciliation with a
single pass: update cloudWorkspaceGraphIsComplete to compute and return the
incomplete workspace IDs for the machine and state, building the resource set
once, then have reconcile compute that set once before iterating bindings and
skip IDs it contains. Preserve the existing handling of unknown tab kinds and
missing catalog resources.
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Sources/Surfaces/CloudWorkspaceProjectionCoordinator.swiftSources/Surfaces/SurfaceCatalog+CloudWorkspaceProjection.swiftSources/Surfaces/Workspace+CloudLayoutProjection.swiftcmuxTests/CloudNativeLayoutProjectionTests.swiftcmuxTests/CloudWorkspaceLiveProjectionTests.swift
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @Sources/Surfaces/CloudWorkspaceProjectionCoordinator.swift:
- Around line 107-109: Update the completeness gate in
CloudWorkspaceProjectionCoordinator so destructive reconciliation requires
machine-wide completeness, preserving the source projection until the
destination can reconcile the tab owned by the accepted CloudVMState. Add a
regression covering a move from workspace a to b with an incomplete destination
inventory, then verify transfer proceeds once the inventory is complete.
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Packages/macOS/CmuxSurfaceCatalogModel/Sources/CmuxSurfaceCatalogModel/CloudVMGraphCompleteness.swiftPackages/macOS/CmuxSurfaceCatalogModel/Tests/CmuxSurfaceCatalogModelTests/CloudVMGraphCompletenessTests.swiftSources/Surfaces/CloudWorkspaceProjectionCoordinator.swiftSources/Surfaces/CmuxTuiSurfaceProviders.swiftcmuxTests/CloudWorkspaceLiveProjectionTests.swift
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# Conflicts: # .github/workflows/ci-web.yml # CLI/CMUXCLI+AutoNaming.swift # CLI/cmux.swift # cmuxTests/TabManagerUnitTests.swift # web/scripts/db-local.sh # web/tests/dashboard-billing-screen.test.tsx
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8e187c2 Fix fullscreen cmux window tiling (manaflow-ai#16638) b59eaf4 fix: unblock Cloud team switching after fleet discovery (manaflow-ai#17142) 2b9404e Fix Cloud directory placeholder during terminal launch (manaflow-ai#17088) a5f3b8e fix: defer sidebar Git probes during terminal typing (manaflow-ai#17060) 1c33e69 Cloud: keep native split layouts by writing layout edits to the machine (manaflow-ai#15786) 126247a testbox: approval helper finds a queued box's run (fix deadlock) (manaflow-ai#17137) # Conflicts: # .github/workflows/ci-guards.yml # .github/workflows/ci-macos.yml # .github/workflows/cmux-tui-testbox-warmup.yml
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Summary
Fixes #15770.
In a Cloud workspace, creating a tab could reorganize the whole split layout, for example collapsing three tabs beside one into a single pane of five. The cause was that the Cloud machine's layout document is the durable record of a bound workspace, and the Mac re-derives its split tree from it on every graph update, but native edits never reached the machine. Moving a tab to another pane, splitting by drag, reordering tabs or dragging a divider changed only the local Bonsplit tree, so the next unrelated update (a new tab, a reconnect, a restore) put back the machine's stale arrangement.
Native layout edits in a bound Cloud workspace are now written to the machine:
CloudLayoutSyncPlanner(CmuxSurfaceCatalogModel) plans one revision-fenced daemon step at a time from a freshsession.snapshot. It usespane.splitwhen a native pane has no machine pane (a scratch terminal holds the new pane open and is then closed),tab.movefor placement and order, andworkspace.layout.applyfor tree shape, directions, ratios and selected tabs once membership matches. Tabs the Mac hasn't projected yet stay beside their neighbors; tabs the machine already closed are dropped. Multi-screen, stack and viewport workspaces are left untouched.CloudWorkspaceLayoutSyncCoordinatorwrites only user edits: it compares the native tree with a baseline recorded when the machine's layout was last applied or written, so resizes, programmatic changes and freshly restored trees never overwrite another client's arrangement. From the edit until the machine has accepted it (including a forced graph refresh), native reconciliation for that machine is held, so an older graph can't re-apply the arrangement being replaced. The whole sync has a 20 s deadline.CmuxTuiSurfaceProvider+LayoutSyncexecutes the steps. A lostpane.splitresponse is replayed with the same idempotency key, and scratch terminals are closed even if the sync is cancelled.The earlier commits on this branch remain: a layout document is applied only when it covers every daemon placement, and Cloud pane cleanup waits for a complete graph, so a partial inventory can neither flatten a split nor close a live pane. Cloud topology restoration uses
SessionSplitContainerLayoutCodec, like local workspaces.Testing
swift test --package-path Packages/macOS/CmuxSurfaceCatalogModel --filter 'CloudLayoutSyncPlannerTests|CloudVMGraphCompletenessTests': 16 tests pass on2603751827. The planner suite drives a simulated daemon that applies the documentedtab.move,pane.split,terminal.closeandworkspace.layout.applyrules. It converges the Cloud: creating a terminal tab collapses split layout into one pane #15770 arrangement (one machine pane with four tabs, three beside one natively), tab moves between panes, reorders, ratio and direction changes, collapse by moving a pane's last tab, nested asymmetric splits, and both membership races.python3 scripts/verify-local.py: 16/16 selected checks pass.issue-15770-cloud-bonsplit-v3(ate3a809b11b, against the shared GCP dev backend). The recorded 3+1 new-tab repro has not yet been dogfooded against a live machine.001daaf301exposed a merged-main compile regression inCLI/cmux.swift:cmux-clireferencedOpenCodePaths, which is compiled only into the app target. Commit9da6a0a41cresolves the sameHOME,OPENCODE_CONFIG_DIR, andXDG_CONFIG_HOMErules inside the CLI target. The prior package and local verification results remain valid; the pushed head is awaiting a fresh CI run.Changelog
Fixed: Cloud workspaces keep the split layout you arrange (moved tabs, drag splits, tab order and divider positions) when tabs are created or the machine reconnects
Demo Video
Checklist
974c2daf74; its six findings are fixed inc1a77ed807)🤖 Generated with Claude Code