[teamleaderleo]

Leo, 2026-10-28, on a screenshot of the top of the sidebar (Search, a ⊘ row, "+ New…", then a workspace row with an app icon): "the alignment". Earlier the same day, on glyphs: "i feel like this is misaligned checkmark :( can we all audit the checkmarks and whatnot". Later, on two blue unread dots beside two red (i) marks: "eg look at this alignment :(".

What changes

One leading icon column. A new token, SidebarStyle.iconColumnCenterX(leading:), is the center of the one iconBox slot that starts at the row inset plus the pill inset. Every leading glyph centers what it draws on that column and on its row's center line:

• band glyphs (Home and the other band rows)
• a pinned workspace's pin
• a pinned group's pin
• a workspace row's icon, which already did

Before this PR, band glyphs and pins started their drawn ink at the inset instead of centering it. Measured on the fleet at the red commit, Home's glyph centered 2 pt and the pin 5 pt left of the workspace icons' center, at every density, in Minimal Mode on and off, and at both widths. Titles keep the one text column (SidebarStyle.leadingTextX).

Header chevrons on the trailing column. The status header, chat history, band section header and machine header (when it has no +) placed their chevrons with their own insets. Each one now centers on SidebarStyle.trailingColumnFrame, the column that every row's dot, spinner and error mark and the group header's chevron already share. The band section header gets its items' trailingTrim so that its chevron lands on its rows' column.

Trailing marks. On this base, the unread dot, the error (i) and Home's dot already share one center x in workspace and band rows. The new test confirms it, and also checks that each mark's art (dot, info, error, done) is centered in its box at 10, 20 and 30 px. The 2 pt drift on inner-tab dots that Leo's screenshot most likely shows was fixed by #26622 (landed 10-28), after which those dots share the trailing column.

Cloud mark. A machine mark already draws only while the sidebar lists more than one machine, and this Mac's rows draw none by default (sidebar.showLocalMachine is off). That matches the "only where it tells local from cloud apart" rule, so it is unchanged.

Audit, not changed here:

• Color-swatch dots: they are color marks, not icons, and keep their own text offset.
• The priority panel and the needs-you tray: they lay out their own action strips, outside the row column.
• The Debug-only trailing badge style: its unread badge chains left of the column.

Takes back #23800 and Lawrence's 2026-10-28 "home and pinned are not aligned" commits (2cf09e1), in part. Their first-ink rule ("a pin's ink starts at the row inset") becomes "a leading glyph centers on the icon column", because Leo asked for one center x. Text columns are unchanged. plans/cmux-next/sidebar-owner.md is updated to the new rule.

Capture

State scripts/cmux-next/media/states/sidebar-icon-column.json: the showcase with the Debug row badge preview rows, so the sidebar shows unread dots (blue), needs-you dots (orange) and error (i) marks (red). These are the marks in Leo's "eg look at this alignment :(" screenshot. At this base they already share one trailing column, before and after. The showcase has no pinned rows, and the stills are at 1x, where Home's 2 pt move is 2 px. SidebarIconColumnTests carries the measured leading change.

Before at 698b3ef64cf0

Light	Dark

After at 35226d0a9a40 (fleet build, capture mini, text checked for private data)

Light	Dark

Review

Codex gpt-6-astra, high, fast, through the review-router route (lane-place found no working review box). At 35226d0 it returned BLOCK: in the card look, the band header took the trailing trim that its card's rows don't, so its chevron sat 4.5 pt right of their marks. Fixed in eea0ccb (SidebarRegionLayout.itemTrailingTrim, one rule for the rows and the header, tested in every look). The re-review at eea0ccb returned SHIP with no findings. After the fix, the 12 affected suites passed on the fleet at eea0ccb (step 22d7327609954036e338ddcb).

Tests

• SidebarIconColumnTests (new):
  • leading glyphs share one center x;
  • each glyph sits on its title's center line;
  • the unread, error and Home marks share one trailing center x and their rows' center lines;
  • the status art is centered in its box.
• HomePinnedRowAlignmentTests and SidebarUniformRowSpacingTests.thePinCentersOnAnUnpinnedRowsIconColumn now check the icon column instead of the ink start.

Performance

No perf numbers: not a performance change. It adds no timers, observers or per-frame work, only layout math on the same layout passes.

Risk

risk:normal. A small, contained sidebar look change: leading glyphs and pins move by up to 5 pt to one center, and four header chevrons move onto the trailing column. Nothing changes in behavior, hit targets or state.

Changelog

• Fixed: sidebar icons, pins and header chevrons line up on one leading column and one trailing column.

Observed / Not run

• Red: cmux-ci run --class light --script scripts/ci/package-test-lane.sh --ref 80b6deec9c53 --arg=suite --arg=Packages/macOS/CmuxNext --arg=SidebarIconColumnTests,HomePinnedRowAlignmentTests. SidebarIconColumnTests failed: Home 2 pt and the pin 5 pt off the icon column in all 12 cases. HomePinnedRowAlignmentTests passed.
• Green: at d4c70d05133 (the head's Swift tree; the later commit adds only the capture state JSON), 20 of 21 suites passed (fleet step ea7e9ad73910b6820b78014c): SidebarIconColumnTests, HomePinnedRowAlignmentTests, SidebarUniformRowSpacingTests, PinnedRowsLookLikeRowsTests, SidebarTrailingColumnTests, GroupHeaderTrailingTests, SidebarChatHistoryTests, HostGroupHeaderStatusTests, MachineIconTests, SidebarGroupRailAlignmentTests, SidebarNestedGroupAlignmentTests, SidebarPinnedRowWidthTests, SidebarDragHeaderTests, SidebarLayoutFoldTests, HomeUnreadBlueDotTests, SidebarGroupMembersAlignTests, SidebarMinimalModeTests, HandSizedLabelClippingTests, SidebarGroupHeaderEveryDensityTests and SidebarRowTitleAndCloseTests. SidebarTrailingColumnGalleryTests ran no tests, as it also does at base 698b3ef64cf (fleet step 49e75c20bcc040df3a4e2bab, where the other 19 suites pass).
• Captures: before at the base and after at the head, light and dark (above).

🤖 Generated with Claude Code

Agent session: agent session

---

^{Need help on this PR? Tag @codesmith-bot with what you need.}

---

Summary by cubic

Aligns the sidebar's leading glyphs (band icons, pins, workspace icons) on one shared icon column and header chevrons on the shared trailing column, fixing the misalignment Leo reported in review.

• Adds SidebarStyle.iconColumnCenterX; leading glyphs now center their ink on the column instead of starting at the row inset, and on their row's center line.
• Status, chat history, band section and machine header chevrons move to the shared trailing column; a band section header uses the same trailing trim rule as its rows (SidebarRegionLayout.itemTrailingTrim) so the chevron lines up with its marks in every look, the card look included.
• Adds SidebarIconColumnTests covering leading, trailing and header alignment across densities and looks, and updates the Home/pinned and pin-spacing tests to check the column instead of the ink start.

^{Written for commit eea0ccb. Summary will update on new commits.}

[cursor]

Bugbot needs on-demand usage enabled

Bugbot uses usage-based billing for this team and requires on-demand usage to be enabled.

A team admin can enable on-demand usage in the Cursor dashboard.

[teamleaderleo]

Owned by an agent session · session

[github-actions]

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

Review eea0ccb: 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=pr27292 -f ref=sidebar-icon-column -f platform=macos -f backend_mode=local

red: cmux-next checks (god files, concurrency, crash safety, l10n); no finished base run on 9d8337e to compare; do not merge until green; see lane-rules

[teamleaderleo]

Bead cx-xy8q8w created for this PR by the cmux coordinator.

[blacksmith-sh]

Found 7 test failures on Blacksmith runners:

Failures

Test	View Logs
/tmp/tmpt2dhafes/summary-fail.json (live):/summary-fail.json (live):	View Logs
/tmp/tmpuntzprik/summary-missing.json (live):/summary-missing.json (live):	View Logs
[new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows/ [new_workspaces] debug.new_workspace timed 0 of 50 new workspace rows	View Logs
[new_workspaces] the window draws no frames/[new_workspaces] the window draws no frames	View Logs
[tabs] debug.tab_switch timed 0 of 40 switches/ [tabs] debug.tab_switch timed 0 of 40 switches	View Logs
[tabs] the window draws no frames/[tabs] the window draws no frames	View Logs
test_the_repository_highlights_validate (main.DigestTests.test_the_repository_highl ights_validate)/ test_the_repository_highlights_validate (main.DigestTests.test_the_repository_highl ights_validate)	View Logs

^{Need help on this PR? Tag @codesmith-bot with what you need.}

[github-actions]

Default changes

This pull request changes 3 defaults at eea0ccbc3b95 (what everyone gets without configuring anything):

• tunable-source.CmuxNextSidebar/Sections/SidebarRegionLayout.swift:isCarded: (none) -> "fadbfe192ccb83f5bea4fe89b1d1b88e0fb66ebd77551025c34237e7751dc018"
• tunable-source.CmuxNextSidebar/Sections/SidebarRegionLayout.swift:itemTrailingTrim: (none) -> "64da5e519cf92b1b632c7b94065bbcb6dbb73e41f00e806c14df2c1e53604cf3"
• tunable-source.CmuxNextSidebar/Sections/SidebarRegionLayout.swift:make: "518afd4cc46fbe02ef0940f6fba5147160b21603f785350de401bf92ec0dff4d" -> "a46ed7c7734c76204a60f7a6d7a52c262ae1ae8d70e01808d6312536d5bb40c3"

Signed off on this commit by review (codex gpt-6-astra high, fast; review-router).

Merge receipt: merged as 1b56d73d08a7 with these defaults changed, signed off by review (codex gpt-6-astra high, fast; review-router).

Regenerate the snapshot with python3 scripts/ci/defaults_guard.py snapshot.

[teamleaderleo]

Review (codex gpt-6-astra high, fast; review-router): SHIP at eea0ccb

The first pass at 35226d0 blocked on the card-look header chevron (it took a trailing trim that its rows don't). That's fixed at this head, and the re-review found no remaining defect. The fleet ran 12 sidebar suites at this head and all passed (step 22d7327609954036e338ddcb). The cmux-next swift test red is the base compile red in BrowserEntryRetirementTests.swift:43 from #27166, which also fails on unrelated PR runs; #27301 fixes it.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/40848323510 at 89e5f8a failed: cmux-next checks (god files, concurrency, crash safety, l10n).
Those jobs last passed at 83fb73e. This pull request is one of 4 merged since: #24804, #27280, #27292, #27303.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.

[github-actions]

Shipped in:

• cmux NEXT nightly 1.0.0-nightly.4085208747701 (16845242a2)
• cmux NEXT nightly 1.0.0-nightly.4085521714601 (784b7c5f2e)
• cmux NEXT nightly 1.0.0-nightly.4085757942901 (da9cf22d45)