[teamleaderleo]

Summary

SidebarRowGutterTests has been red on feat-cmux-next since #22733 (0d62303, "row pills stop short of the edge"). That PR made every sidebar row end SidebarStyle.rowTrailingTrim (Metrics.space4, 8 pt) before the list's right inset, so the pill never reaches the sidebar's edge (Leo 2026-10-20: "trim the pill's right side"). It did not update this suite, which still expected the pill to end exactly at the inset and at the divider's right edge.

The change was deliberate, so the test is what's out of date and this PR is test-only:

• selectedAndUnselectedRowsHaveEqualLeadingAndTrailingInsets: the pill's right inset is horizontalInset + rowTrailingTrim. The checks that the content's leading and trailing insets inside the pill are equal, and that the pill's left inset is the gutter, stay the same.
• thePillAlignsWithTheSectionHeaderAndTheDivider: the pill ends rowTrailingTrim before the divider's right edge. Its left edge still lines up with the header and the divider.

No product code changes.

Evidence

• Command: cmux-ci run --class light --script scripts/ci/package-test-lane.sh --arg=suite --arg=Packages/macOS/CmuxNext --arg=SidebarRowGutterTests --env CMUX_CI_XCODE_APP=/Applications/Xcode_26.6.app
• Red on base 27ed896: fleet step 0675fe8cc69e7a258abc3dd8. At :69 the trailing inset is not the gutter, and at :81 pill.maxX 226 != aboveLine.frame.maxX 234 (exactly the 8 pt trim).
• Green on head 21785c0: fleet step 3167c900cb816a8856eed142, 3/3 tests passed.

Observed / Not run

• Observed: the base red step above and the head green step (Xcode 26.6, package-test-lane). The prepush gate is clean.
• Not run: other suites. Builds on a newer tip (d483541) currently fail to compile in CmuxNextPagesTests/PageEnginePolicyTests.swift:43, a separate base red. That is why this branch is based on 27ed896, the tip the red step ran on.

Changelog

none

Agent session: cosmic-gray

🤖 Generated with Claude Code

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Summary by cubic

Updates SidebarRowGutterTests to match #22733's deliberate trim, which now ends each sidebar pill SidebarStyle.rowTrailingTrim (8 pt) short of the sidebar's right edge. The suite has been red on feat-cmux-next since that change; this PR is test-only with no product code changes.

• The pill's right inset is now horizontalInset + rowTrailingTrim; its left inset and the equal content insets inside the pill are unchanged.
• The pill now ends rowTrailingTrim before the divider's right edge instead of exactly at it.

^{Written for commit 3820e82. Summary will update on new commits.}

[github-actions]

cmux status _{(one comment, edited in place; each line is updated by the job that owns it)}

Review 3820e82: HQ feed card · gallery before/after runs · checks

App of this head (app.zip, kept 1 day)

gh workflow run reload-build.yml -R manaflow-ai/cmux --ref feat-cmux-next -f tag=pr23304 -f ref=cmux/fix-sidebar-gutter-trim -f platform=macos -f backend_mode=local

Not verified: macOS jobs did not run: compile and app tests were skipped on 3820e82638; ci-status is green without them.

CI passes on 3820e82638 (run 39600691965 attempt 1).
macOS jobs did not run: compile and app tests were skipped: Fast static checks skipped (the macos job needs both to succeed). Re-run CI once they pass, before merging.

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way, seen on other PRs that it failed on another pull request's run lately.

web and size checks: green

[teamleaderleo]

Owned by update-survival on cosmic-gray · session

[teamleaderleo]

Bead cx-bbys3 created for this PR by the cmux coordinator.

[github-actions]

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.3961101575901 (101cc33db2)
• cmux NEXT nightly 1.0.0-nightly.3961563706401 (5c92af7a3b)