fix(terminal): reflow surviving panes after split changes - #12835
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Included review availability: Your plan provides up to 10 included reviews per hour; 4 remain after this review. 📝 WalkthroughWalkthroughTerminal views now synchronize cached cell metrics during cell-size actions and pane geometry updates. New AppKit integration tests cover backing-scale conversion, hidden-output reflow, stale metric repair, and resize-state recovery. ChangesTerminal metric and pane geometry synchronization
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to No actionable behavior or integration defect is established in the reviewed changes. The targeted pane-metric tests are reported passing; complete the normal current-head build validation before release. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 3 systems. Changed systems: Architecture concerns Review detailsSystems and components
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Inline comments:
In `@cmuxTests/TerminalPaneMetricsWindow.swift`:
- Around line 5-8: Add explicit empty deinit declarations to both
TerminalPaneMetricsWindow and TerminalPaneMetricsFixture to satisfy the
required_deinit lint rule; do not add teardown assertions.
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Packages/macOS/CmuxTerminalCore/Sources/CmuxTerminalCore/SurfaceValues/TerminalPortalResizePhase.swiftPackages/macOS/CmuxTerminalCore/Tests/CmuxTerminalCoreTests/TerminalPortalResizeRecoveryTests.swiftSources/GhosttyNSView+CellMetrics.swiftSources/GhosttyTerminalView.swiftSources/TerminalWindowPortal.swiftcmux.xcodeproj/project.pbxprojcmuxTests/TerminalPaneMetricInvalidationTests.swiftcmuxTests/TerminalPaneMetricsFixture.swiftcmuxTests/TerminalPaneMetricsWindow.swift
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Mac fleet instructions for head JOB_JSON=$(~/.local/bin/cmux-ci submit --kind cmux --command 'CMUX_FLEET_BUILD_TAG=pr-12835-dc8c6492 /Users/Shared/cmux-build-fleet/recipes/cmux.sh https://github.com/manaflow-ai/cmux.git dc8c64922c21cfaea8110d81f12178561b4e5d58' --artifact artifacts/cmux.app.zip --workspace https://github.com/manaflow-ai/cmux/pull/12835 --source-digest dc8c64922c21cfaea8110d81f12178561b4e5d58 --cache-key cmux:pr-12835 --min-free-bytes 268435456000 --label cmux --label ram48)
JOB_ID=$(python3 -c 'import json,sys; print(json.load(sys.stdin)["id"])' <<<"$JOB_JSON")
~/.local/bin/cmux-ci wait "$JOB_ID" --receipt artifacts/fleet/$JOB_ID.json
~/.local/bin/cmux-ci publish-hq "$JOB_ID"Use an existing campaign job ID if one is already posted; do not submit a duplicate. A wait timeout leaves the remote job running. Published results will include an exact-head artifact link and timing/disk receipt. This recipe validates the macOS app only, not iOS or tests. Never use maclease or put credentials in a PR comment. |
…low-metrics # Conflicts: # cmux.xcodeproj/project.pbxproj
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…low-metrics # Conflicts: # cmux.xcodeproj/project.pbxproj
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Review audit rechecked at HEAD
No unresolved review threads or new actionable top-level findings are present in the current PR review state. The final test oracle adjustment uses Ghostty's direct viewport text reader while retaining native render-grid span checks for physical reflow. |
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2 issues found across 6 files
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Prompt for AI agents (unresolved issues)
Check if these issues are valid — if so, understand the root cause of each and fix them. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. If appropriate, use sub-agents to investigate and fix each issue separately.
<file name="cmuxTests/TerminalPaneMetricsFixture.swift">
<violation number="1" location="cmuxTests/TerminalPaneMetricsFixture.swift:119">
P2: This fixture starts `/bin/cat` but frees the runtime without killing its shell, so the subsequent `teardownSurface()` cannot close it. Use the hosted teardown helper to kill the process before teardown and avoid leaking test processes or delaying later tests.</violation>
</file>
<file name="Sources/GhosttyTerminalView.swift">
<violation number="1" location="Sources/GhosttyTerminalView.swift:5457">
P2: A queued `GHOSTTY_ACTION_CELL_SIZE` callback can overwrite this live-metric refresh with its captured size after the geometry commit. Change the callback to treat the payload as an invalidation and call `synchronizeCellMetrics()` instead of assigning it directly.</violation>
</file>
Reply with feedback, questions, or to request a fix.
Re-trigger cubic
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||
| func tearDown() { | ||
| TerminalWindowPortalRegistry.detach(hostedView: hosted) | ||
| surface.releaseSurfaceForTesting() |
There was a problem hiding this comment.
P2: This fixture starts /bin/cat but frees the runtime without killing its shell, so the subsequent teardownSurface() cannot close it. Use the hosted teardown helper to kill the process before teardown and avoid leaking test processes or delaying later tests.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At cmuxTests/TerminalPaneMetricsFixture.swift, line 119:
<comment>This fixture starts `/bin/cat` but frees the runtime without killing its shell, so the subsequent `teardownSurface()` cannot close it. Use the hosted teardown helper to kill the process before teardown and avoid leaking test processes or delaying later tests.</comment>
<file context>
@@ -0,0 +1,124 @@
+
+ func tearDown() {
+ TerminalWindowPortalRegistry.detach(hostedView: hosted)
+ surface.releaseSurfaceForTesting()
+ surface.teardownSurface()
+ window.close()
</file context>
| let didChangeDrawable = applyDrawableGeometry(geometry) | ||
| let surfaceSizeChanged = terminalSurface.commitPaneGeometry(geometry) | ||
| return didChangeDrawable || surfaceSizeChanged | ||
| return synchronizeCellMetrics() || didChangeDrawable || surfaceSizeChanged |
There was a problem hiding this comment.
P2: A queued GHOSTTY_ACTION_CELL_SIZE callback can overwrite this live-metric refresh with its captured size after the geometry commit. Change the callback to treat the payload as an invalidation and call synchronizeCellMetrics() instead of assigning it directly.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At Sources/GhosttyTerminalView.swift, line 5457:
<comment>A queued `GHOSTTY_ACTION_CELL_SIZE` callback can overwrite this live-metric refresh with its captured size after the geometry commit. Change the callback to treat the payload as an invalidation and call `synchronizeCellMetrics()` instead of assigning it directly.</comment>
<file context>
@@ -5454,7 +5454,7 @@ class GhosttyNSView: NSView, NSUserInterfaceValidations {
let didChangeDrawable = applyDrawableGeometry(geometry)
let surfaceSizeChanged = terminalSurface.commitPaneGeometry(geometry)
- return didChangeDrawable || surfaceSizeChanged
+ return synchronizeCellMetrics() || didChangeDrawable || surfaceSizeChanged
}
</file context>
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Summary
Pane close and divider changes could leave cached AppKit cell metrics larger than Ghostty's live metrics. Use cell-size callbacks as invalidation signals: read the live surface in logical points, and repair the cache after committed geometry updates, reapplication, and same-frame reconciliation.
This integrates with the committed-pane geometry architecture now on main. It preserves that single resize authority and does not restore the obsolete resize-phase gate. Behavior coverage extends #12381's hidden-output/reveal repro through divider narrowing/widening and sibling removal, checks native grid spans and complete output preservation, and exercises stale metric repair at 1×/2× backing scales. Resize-completion tests now assert interactive-to-settled commits, including a missed native end callback.
Trade-off: geometry reconciliation adds a constant-time read of live native metrics. Notifications are emitted only when the logical cell size changes. The implementation remains a small addition to existing geometry paths.
Closes #12381.
Testing
Current HEAD:
dc8c64922c21cfaea8110d81f12178561b4e5d58.gh workflow run failed. The shared GitHub REST quota is exhausted until September 18, 8:55 PM PT. No run URL was returned. Nonexistent fleet manifests and disabled local fallback stopped the fallback path; no fallback build ran. The tag opener still refers to the earlier build and is not current-HEAD evidence.Earlier revision
5209dd7passed six native tests and live macOS 26.5 / 2× display verification: hidden output survived reveal, native divider drags changed the surviving grid 68 → 36 → 76 columns, and Command-W on its sibling expanded it to 94. All five rulers remained intact and cells stayed 8×17 points without window resize, fullscreen, or config reload. That recording documents the earlier revision; the integration with current main requires fresh user dogfood. macOS 27 customer dogfood remains unverified.Demo Video
Earlier-revision native recording:
cmuxterm-hq/artifacts/verify-remote/issue-12381-split-reflow-metrics/visual/pane-reflow-demo.mp4. Screenshots, geometry samples, reproduction script, and logs are retained with it. The video has not been uploaded to GitHub.Checklist
Summary by CodeRabbit
Bug Fixes
Tests