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test: keep saved window and sidebar state from leaking between app-host and UI tests - #15953
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… window Closing a main window saves its size, and a later window with no source window opens at it. testCmdShiftNCreatesWindowFromEventWindowWithoutAddingWorkspace closes a 560 pt window, which leaves every later test window a 320 pt terminal area beside the 240 pt sidebar, and split admission (#15392) refuses a split there. The first test of the pair closes a 560 pt window; the second must still split. Refs #15488 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A new main window takes its size from the saved geometry of the last window closed, and its right sidebar's visibility, width and mode from the last values saved. App-host tests share one defaults domain, so a test that narrowed its window or showed the right sidebar set up every later test's windows in the same host process. Since split admission (#15392) refuses a split that would leave a pane under 160 pt, the tests that ran after a narrow window failed their splits: AppDelegateEqualizeSplitsShortcutTests, RemoteTmuxMirrorSplitRoutingTests, WorkspaceManualUnreadTests and others, depending on shard packing. Each XCTest case now runs with none of these values saved and puts back what was saved when it ends (CmuxTestsPrincipal), and every Swift Testing suite that opens main windows takes .isolatedMainWindowDefaults for the same scope. Refs #15488 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The per-run home the app host gets (HOME, CFFIXED_USER_HOME) does not move its preferences: cfprefsd keeps them in the runner account's own com.cmuxterm.app.debug domain, shared by every job on the Mac and kept across jobs. The fleet Macs carried values earlier runs left there: the right sidebar shown on all of them (Dock mode on cmux7s), saved window frames, a 75% terminal font magnification on cmux9s and the tmux overlay experiment on cmux13s. Tests on those Macs alone failed their splits, found a Dock already created with a new window (testWorkspaceTerminalFontSizeShortcutSeedsDockCreatedAfterShortcut), measured font sizes off by the magnification (CloudRestoreReplayGridTests, TerminalFontZoomSessionPersistenceTests), and had Cmd+D refused in BrowserPaneNavigationKeybindUITests. reset-app-defaults.sh deletes the DEV build's own domain, never a release app's, before each isolated app-host batch and before each display UI regression. Both callers hold the Mac's GUI token. Refs #15488 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 4 remain after this review. 📝 WalkthroughWalkthroughTest support now isolates selected main-window defaults across test cases. Multiple suites use the isolation trait. CI scripts reset the debug app preferences domain before selected runs. ChangesMain-window defaults isolation
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Other Merge Risk: 🔵 Low · up to Parallel UI tests can change each other’s saved window and sidebar settings, causing intermittent test failures. Serialize the full isolation scope before relying on this change. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The changes affect test setup and selected CI runs. Preference deletion is restricted to debug-app domains, and the flagged entrypoints are test methods rather than application-facing APIs. Risk remains low because shared-runner ownership and recovery after interruption are not fully established. Retained concerns Security review detailsSecurity Blast Radius
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Review comments at @cmuxTests/AppDelegateMainWindowTestingSupport.swift:
- Around line 448-455: Update IsolatedMainWindowDefaultsTrait.provideScope to
serialize the entire MainWindowDefaultsIsolation.begin(), test-body, and end()
interval using a separate shared async gate. Do not reuse AppContextSerialGate,
since suites may already hold it while entering this scope.
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cmuxTests/AppDelegateBareSpaceShortcutRoutingTests.swiftcmuxTests/AppDelegateDisplayConfigRestoreTests.swiftcmuxTests/AppDelegateEqualizeSplitsShortcutTests.swiftcmuxTests/AppDelegateFullScreenFrameRestoreTests.swiftcmuxTests/AppDelegateMainWindowTestingSupport.swiftcmuxTests/AppDelegateOptionDigitShortcutRoutingTests.swiftcmuxTests/AppDelegateRenameShortcutContextTests.swiftcmuxTests/AppDelegateSurfaceShortcutRoutingTests.swiftcmuxTests/AppDelegateTerminalTypingShortcutFastPathTests.swiftcmuxTests/CanvasShortcutContextTests.swiftcmuxTests/ClosedMainWindowRoutingTests.swiftcmuxTests/FileEditorWordWrapShortcutTests.swiftcmuxTests/GlobalSearchShortcutBehaviorTests.swiftcmuxTests/KeyboardShortcutContextSwiftTests.swiftcmuxTests/MainWindowCloseTerminationRoutingTests.swiftcmuxTests/MainWindowFocusRestoreTests.swiftcmuxTests/MobilePanelArtifactResolutionTests.swiftcmuxTests/NarrowWindowSidePanelFitTests.swiftcmuxTests/PaneResizeShortcutTests.swiftcmuxTests/RemoteTmuxMirrorCLIObservabilityTests.swiftcmuxTests/RemoteTmuxMirrorCloseDetachTests.swiftcmuxTests/RemoteTmuxMirrorEnvironmentPushTests.swiftcmuxTests/RemoteTmuxMirrorPaneInputMappingTests.swiftcmuxTests/RemoteTmuxMirrorPlacementTests.swiftcmuxTests/RemoteTmuxMirrorSplitRoutingTests.swiftcmuxTests/RemoteTmuxMirrorTargetingTests.swiftcmuxTests/RemoteTmuxMirrorWorkspaceNameTests.swiftcmuxTests/RemoteTmuxNewWindowCwdTests.swiftcmuxTests/RemoteTmuxNotificationLifecycleTests.swiftcmuxTests/ReopenLastClosedTests.swiftcmuxTests/SidebarEmptyAreaNewWorkspaceActionTests.swiftcmuxTests/SidebarFileDropFindRoutingTests.swiftcmuxTests/SidebarGitProcessCompositionTests.swiftcmuxTests/SidebarWorkspaceSwitchLayoutFaultTests.swiftcmuxTests/SurfacePaneFactoryFocusTests.swiftcmuxTests/TextBoxEscapePassthroughTests.swiftcmuxTests/WorkspaceGroupCycleShortcutTests.swiftcmuxTests/WorkspaceGroupNumberedSelectionTests.swiftscripts/ci/reset-app-defaults.shscripts/ci/run-app-host-xcodebuild.shscripts/ci/run-display-ui-regressions.sh
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Review follow-ups for the window-defaults isolation: - Write a key back only when its value differs, and remove only keys that are present, so a test that never touches them posts no defaults notification (every write posts one, even an identical value). - Run the Swift Testing trait's writes on the main actor: a defaults write waits for observers on the main queue, so a background write holding the isolation lock could wait on a main thread that waits for the lock. - Give RemoteTmuxMirrorRenameTests the trait; its harness opens main windows. - Unit-test the isolation directly against a recording suite domain. - Register reset-app-defaults.sh as an app-host script so an edit to it runs app-host tests, call it through ci_script_dir, find the app the way other CI steps do, and do nothing outside GitHub Actions, where it would wipe a tagged build's settings. Refs #15488 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Foundation removes a defaults key by setting it to nil, so the recording domain logged each removal twice and the exact-list assertion failed with [added, added, changed] on the fleet, although the isolation wrote the right keys. What matters is which keys were written: compare the set. Refs #15488 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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App-host and UI tests inherited window and sidebar state from earlier tests and earlier jobs on the same Mac. Since split admission (#15392) refuses a split that would leave a pane narrower than 160 pt, which tests had room to split depended on shard packing and on which fleet Mac ran the shard. Each test now starts from the app's defaults and gives back what it found. This is the split-failure cluster in #15488.
Two leaks
Within one app-host process. When a main window closes, it saves its frame as the last window geometry. A new window with no source window opens at that size, and at the right sidebar's last saved visibility, width and mode.
AppDelegateShortcutRoutingTests.testCmdShiftNCreatesWindowFromEventWindowWithoutAddingWorkspacecloses a 560 pt window. That leaves every later window a 320 pt terminal area beside the 240 pt sidebar, one point short of a horizontal split. An instrumented rerun at 478e323 showed this directly: a fresh window opened at the saved 640×512 frame, andsplitSpaceVerdictturnednoSpaceafter one split.Across jobs on a fleet Mac. The per-run home (
HOME,CFFIXED_USER_HOME) does not move an app's preferences. cfprefsd keeps them in the runner account's owncom.cmuxterm.app.debugdomain, shared by every job and kept across jobs. A local probe confirmed it: adefaults writeunder a fakeCFFIXED_USER_HOMElanded in the real domain. Reading that domain on the minis (ssh cmux@<mini> defaults export com.cmuxterm.app.debug -) found 92–124 keys left by earlier runs:A new window on those Macs lost 276 pt to the right sidebar. On cmux7s the sidebar also created a Dock, which is why
testWorkspaceTerminalFontSizeShortcutSeedsDockCreatedAfterShortcutfound one already there. The font magnification is whyCloudRestoreReplayGridTestsandTerminalFontZoomSessionPersistenceTestsfailed only on cmux9s and cmux14, with sizes off by exactly the magnification. The same saved state reachedBrowserPaneNavigationKeybindUITests: in run 36680987910 Cmd+D recordedlastSplitDirection rightwithpaneCountAfterSplit 1.What changes
MainWindowDefaultsIsolationremoves the saved window geometry and the right sidebar'sfileExplorer.isVisible,fileExplorer.widthandrightSidebar.modefor the length of a test, then puts back what was there.CmuxTestsPrincipalapplies it to every XCTest case..isolatedMainWindowDefaults. The trait does its defaults writes on the main actor. A defaults write waits for observers registered on the main queue, so a background write that holds the isolation lock could wait on a main thread that is waiting for that lock.UserDefaults.didChangeNotificationto every observer in the process, even for an identical value. A test that never touches these keys now writes nothing.scripts/ci/reset-app-defaults.shdeletes the DEV build's own defaults domain before each isolated app-host batch (run-app-host-xcodebuild.sh) and before each display UI regression.choose_ci_suite.py's app-host consumers, so a PR that edits it runs app-host tests.Nothing here changes app code or admission behavior.
Evidence
The new XCTest pair in
AppDelegateBareSpaceShortcutRoutingTestsreproduces the in-process leak deterministically. The first test closes a 560 pt window; the second, which XCTest runs next by name order, must still split. Both runs use the app build from full-suite run 36685498203, with 5 iterations, viaapp-host-test-rerun.yml:testWindowGeometryIsolation2NextTestWindowStillSplitsfailed 5 of 5 iterations ("a window opened at an earlier test's 560 pt size has no room for a split").RemoteTmuxMirrorSplitRoutingTests,AppDelegateEqualizeSplitsShortcutTests,WorkspaceManualUnreadTests). It ran on cmux10s-mac-mini-glaeda-2, where shard 1 failed those tests in each of main's last three full-suite runs, and loggedCleared the persistent defaults earlier runs left in com.cmuxterm.app.debug.testDefaultsKeyIsolationRestoresOnlyChangedKeyschecks the isolation directly against a suite domain that records writes. A scope over absent keys writes nothing, nested scopes restore once, and only changed keys are written back. The review follow-ups, rebased onto the validation build, are running as run 36720211217: the wholeAppDelegateBareSpaceShortcutRoutingTestsclass,RemoteTmuxMirrorRenameTests,AppDelegateEqualizeSplitsShortcutTestsandRemoteTmuxMirrorSplitRoutingTests, 3 iterations each.scripts/ci/reset-app-defaults.shwas exercised locally against probe domains. WithGITHUB_ACTIONS=trueand a stubbeddefaults, a DEV-pattern domain is cleared and a second run is a no-op, a release-pattern domain is left alone, an app found only by thefindfallback is cleared, and a missing product exits 0. WithoutGITHUB_ACTIONSit changes nothing.tests/test_ci_change_areas.pypasses with the new consumer path. The app-host wrapper guards pass locally:test_ci_app_host_xcodebuild_retry.sh,test_ci_app_host_xcodebuild_attempts.sh,test_ci_app_host_home_isolation.pyandtest_ci_app_host_pipe_capture.py.The cross-job leak needs a fleet Mac with that saved state; the green run above is one. The full-suite validation of the #15488 repair (#15960) runs every shard on the minis.
#15985 clears the saved frame when a test process launches, which also covers the launch window in local runs. It does not cover what one test leaves for the next test in the same process, or the sidebar and font state, so the two PRs complement each other. Both add a test at the same spot in
AppDelegateBareSpaceShortcutRoutingTests.swift; whichever lands second keeps both. #15919, which sized two split fixtures by hand, was closed in favor of #15985.Changelog
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