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feat(custom-sidebars): fixedSize and reactive frame specs for JS sidebars - #14845
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teamleaderleo merged 4 commits intoSep 27, 2026
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JS sidebars can now keep a view at its natural size with `.fixedSize()`
(or `.fixedSize("horizontal"|"vertical")`), applied right after the text
limits so a button or badge beside stretching text isn't squeezed.
`.frame(() => ({ ... }))` now binds each returned key live. Before, the
runtime read the keys of the function object, found none, and dropped
the frame without an error.
The JS docs now list `.layoutPriority(n)`, which the runtime already
supported, alongside the two additions.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository: manaflow-ai/cmux/.coderabbit.yaml Review profile: ASSERTIVE Plan: Advanced Run ID: 📒 Files selected for processing (1)
Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughThe sidebar runtime now supports function-valued frame specifications with reactive values and exposes ChangesSidebar Layout
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Feature Suggested reviewers: Merge Risk: ⚪ Minimal · up to The sidebar sizing and reactive-frame changes appear mergeable after normal checks. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The new sizing features remain within sidebar rendering, with no demonstrated new privileged access. An error during a reactive update could leave some layout values refreshed and others unchanged; the origin and recovery behavior of sidebar scripts are not fully established. Retained concerns Security review detailsSecurity Blast Radius
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Inline comments:
In
`@Packages/macOS/CmuxSwiftRenderUI/Tests/CmuxSwiftRenderUITests/SidebarJSRuntimeTests.swift`:
- Around line 31-54: Add an NSHostingView rendered-size test for
SceneNodeContent that verifies fixedSize retains natural sizing on both axes and
on the requested single axis. Anchor the test to the existing fixedSize coverage
and assert measured layout behavior so it catches removal of SceneFixedSize from
styled(_:) or swapped horizontal and vertical arguments.
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Packages/macOS/CmuxSwiftRenderUI/Sources/CmuxSwiftRenderUI/Rendering/RenderStyle.swiftPackages/macOS/CmuxSwiftRenderUI/Sources/CmuxSwiftRenderUI/Resources/SidebarRuntime.jsPackages/macOS/CmuxSwiftRenderUI/Sources/CmuxSwiftRenderUI/Runtime/SceneNodeView.swiftPackages/macOS/CmuxSwiftRenderUI/Tests/CmuxSwiftRenderUITests/SidebarJSRuntimeTests.swiftdocs/custom-sidebars.md
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Mounts JS sidebars in NSHostingController and checks the sizes SwiftUI negotiates under a narrow proposal: fixedSize keeps a single-line label's natural width, "horizontal" keeps only width natural, and "vertical" keeps only height natural. Removing SceneFixedSize from the modifier chain, or swapping the axes in dslFixedSizeAxes, fails these tests. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Merged, thanks @bquigley1 :) I added one small change on top: |
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rustybret
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Sep 27, 2026
82c26b3 ci: take the gui token in the app-host shard's restore, not at job start (manaflow-ai#15012) 3761671 iOS: fix stale team nightly floor expectation in What's New copy test (manaflow-ai#14917) 5e19a98 docs: focus custom sidebar tabs by surfaceId in the actions example (manaflow-ai#15002) 294ee6e sidebar: Strip inline Markdown from notification previews (manaflow-ai#12030) ceb3030 Keep detached workspace process titles updateable (manaflow-ai#4947) 8be7364 test: kill hosted test shells before freeing their terminals (manaflow-ai#14957) da291df cmux-tui: do not query the host terminal when the reply cannot be read (manaflow-ai#12419) 98767c8 ci: keep earlier reviewed CLA policies valid for branches behind main (manaflow-ai#15008) 7167b77 feat(custom-sidebars): fixedSize and reactive frame specs for JS sidebars (manaflow-ai#14845) 716bbb5 Fix notification hook descriptor inheritance (manaflow-ai#11649) 03b191d cmux-tui: pass the zig target on a native windows-gnu host (manaflow-ai#12416) c9a6a0e docs: load the deep review protocol only when needed (manaflow-ai#15007) e5af879 Match pane indicator strokes and the file path header to shared chrome metrics (manaflow-ai#14982) 0def9e1 Show one fixed subtitle for each Settings row and fix localized labels (manaflow-ai#14883) 1921636 ci: route picker-less macOS lanes to the owned minis for trusted events (manaflow-ai#14794) # Conflicts: # .github/workflows/app-host-test-rerun.yml # .github/workflows/auth-refresh-tests.yml # .github/workflows/ci-health-report.yml # .github/workflows/ci-macos.yml # .github/workflows/ci-owned-pool-rescue.yml # .github/workflows/ci-repo-variables.yml # .github/workflows/cloud-command-deadlines.yml # .github/workflows/cloud-machine-tests.yml # .github/workflows/cloud-task-local-tests.yml # .github/workflows/cmux-tui.yml # .github/workflows/iroh-v2.yml # .github/workflows/relay-tls.yml # .github/workflows/reload-build.yml # .github/workflows/remote-daemon.yml # .github/workflows/resolve-dispatch-ref.yml # .github/workflows/terminal-hang-diagnostics.yml
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Summary
Building JS custom sidebars, the most common layout problem I hit was a button or count badge next to stretching text getting squeezed to a blank sliver: the text was
lineLimit(1)withmaxWidth: "infinity", the button waslineLimit(1)too, both got the default textlayoutPriorityof 1, and SwiftUI split the width. JS sidebars had no.fixedSize(), and.layoutPriority()works but isn't in the JS docs, so there was no documented way out.This adds:
.fixedSize()on any JS node, or.fixedSize("horizontal")/.fixedSize("vertical")for one axis. It's applied right after the text limits (the order doc comment inSceneNodeViewis updated), so the view keeps its natural size before padding and frames..frame(() => ({ ... })): a function spec now binds each key it returns. Before,handle.framereadObject.keysof the function object, found none, and dropped the frame without an error, so a live width like a usage bar never applied. Keys come from the first evaluation; the per-key form.frame({ width: () => ... })already worked and is unchanged.docs/custom-sidebars.mdlists.layoutPriority(n)(with the "truncating text defaults to 1" note),.fixedSize(), and the function form of.frame.Testing
swift test --package-path Packages/macOS/CmuxSwiftRenderUI: 48 tests in 7 suites pass. New tests inSidebarJSRuntimeTests:fixedSizeReachesTheNode:.fixedSize()and.fixedSize("horizontal")land on the node asbool(true)/string("horizontal").fixedSizeAxesMapping: the prop → axes mapping fortrue,"both","horizontal","vertical",false, and absent.frameAcceptsAReactiveSpec: a data-driven.frame(() => ...)sets width/height and updates when the data changes.SceneNodeViewRenderingTestsmeasures the result through the real host view (NSHostingController.sizeThatFitsunder a 40pt-wide proposal):fixedSizeKeepsNaturalWidthWhenSqueezed: a single-line label stays at or under 40pt without.fixedSize()and keeps its natural width (> 40pt) with it.fixedSizeHonorsTheRequestedAxis:"horizontal"keeps width natural;"vertical"keeps width within 40pt and height natural.Removing
SceneFixedSizefrom the modifier chain fails both; swapping the axes indslFixedSizeAxesfails the second.With only the
SidebarRuntime.jschange reverted,fixedSizeReachesTheNodefails (TypeError: Text("both").fixedSize is not a function) andframeAcceptsAReactiveSpecfails (width and height staynil), so both cover the new behavior.The full app wasn't built (no Zig/Rust toolchain here), so I haven't seen it in a running sidebar; the sizing is covered at the
SceneNodeViewlevel above. The change is internal toCmuxSwiftRenderUIwith no public API change.Checklist
docs/custom-sidebars.md)Need help on this PR? Tag
@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
JS custom sidebars can now keep views at their natural size with
.fixedSize(), and reactive.frame(() => ({ ... }))specs now apply live instead of being silently dropped.Bug Fixes
.frame()specs were dropped silently because the runtime read the keys of the function object; they now bind each returned key on every evaluation, with keys read untracked from the first evaluation so a.frame(fn)inside aForEachrow doesn't subscribe the list effect.New Features
.fixedSize()(with"horizontal"or"vertical"for one axis) applies right after text limits so a button or badge beside stretching text isn't squeezed..fixedSize()keeps a squeezed single-line label at natural width, and each axis token keeps only its own axis natural.docs/custom-sidebars.mddocuments.fixedSize(), the function form of.frame(), and.layoutPriority(n), which the runtime already supported.Written for commit 9d29813. Summary will update on new commits.
Summary by CodeRabbit
New Features
Documentation
Changelog
Added: Custom sidebar views take
.fixedSize()(optionally per axis), and.frame(() => ({...}))binds every key live