cmux NEXT: Jump to latest morphs into pulsing accent dots while the agent works by teamleaderleo · Pull Request #21800 · manaflow-ai/cmux

teamleaderleo · 2026-10-18T22:47:05Z

Leo pointed at Claude desktop's Code tab: its scroll-to-bottom button turns into softly pulsing dots while the model is thinking.

cmux NEXT already had Jump to latest: a glass circle that shows while you're scrolled up, with dots while working. Before this change it swapped glyphs instantly, and the dots were text-colored with an opacity-only blink. Now it matches the reference:

Morph: the arrow and the dots share one grid cell. While the agent works, the arrow shrinks and fades out as the dots grow in, and the reverse happens when the turn ends. This uses the pane's --agent-motion-in and --agent-ease-out tokens.
Accent dots: the dots use var(--agent-accent), with no literal colors.
Pulse: each dot runs a staggered opacity and scale wave. The animation runs only while working, so hidden dots don't keep compositor work going.
Reduce Motion: every transition and animation stays under prefers-reduced-motion: no-preference. Reduced motion gets static dots with no morph, the same as data-status-indicators="static".
No change to the shape: it's still a true circle (32×32, 50%), and the dots are 4×4 circles, so agent-pane-no-capsules passes. The tooltip is unchanged: it's an icon-only button and its label is localized in all 21 locales already, so no new strings.

Click behavior is unchanged: it scrolls to the latest row.

Screenshots

Gallery entries jump-latest (arrow) and jump-latest-working (dots): see the gallery-advisory receipt below.

Tests

Local runs, with the agent-pane bundle built: agent-pane-no-capsules, tooltip-rules, theme-colors, agent-pane-styles and agent-pane-follow-live (the browser lane is skipped locally).

🤖 Generated with Claude Code

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Summary by cubic

Updates the cmux NEXT Jump to latest button to morph its arrow into pulsing accent dots while the agent works, matching Claude desktop's Code tab. Previously the arrow and dots swapped glyphs instantly and the dots blinked in text color; now both share one grid cell and cross-fade with a scale, and the dots take the theme accent in a staggered opacity and scale wave.

The dots pulse only while working, so hidden dots don't keep the compositor busy.
Reduced motion and data-status-indicators="static" show still dots with no morph.
The working-state test fixture now renders the button with data-working so the dot loop is covered.
The button shape, tooltip, and click-to-scroll behavior are unchanged.

^{Written for commit 2d44aa3. Summary will update on new commits.}

…hile the agent works The arrow and the dots share one cell and cross-fade with a scale, so the button morphs instead of swapping. The dots take the theme accent and pulse in a staggered opacity and scale wave. Reduce Motion and static status indicators keep still dots, swapped without the morph. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

coderabbitai · 2026-10-18T22:47:13Z

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github-actions · 2026-10-18T22:47:14Z

Receipt for 2d44aa3 (this PR's head; a new push replaces it)

Visual review: HQ feed card · gallery before/after runs
Checks: this head
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=pr21800 -f ref=feat/next-scroll-thinking-dots -f platform=macos -f backend_mode=local

teamleaderleo · 2026-10-18T22:49:18Z

Bead cx-8vutr created for this PR by the cmux coordinator.

blacksmith-sh · 2026-10-18T22:54:37Z

Found 4 test failures on Blacksmith runners:

Failures

Test	View Logs
`/tmp/tmpdufa2fq9/summary-missing.json (live):/summary-missing.json (live):`	View Logs
`/tmp/tmpmtrvfvuy/summary-fail.json (live):/summary-fail.json (live):`	View Logs
`test/narrow-layouts.test.ts/narrow-layouts.test`	View Logs
`test/narrow-layouts.test.ts/narrow-layouts.test`	View Logs

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github-actions · 2026-10-18T23:05:17Z

red: web / Web status; do not merge until green; see lane-rules
red: web / react-apps-check; do not merge until green; see lane-rules
red: web / react-apps-check (2); do not merge until green; see lane-rules

github-actions · 2026-10-18T23:05:36Z

Unclear: web / react-apps-check (2) failed: no known signature; failed step: Test webviews.

CI failed on 2d44aa34b1 (run 39176756551 attempt 1): 2 unknown.

Job	Verdict	Why
web / react-apps-check (2)	unknown	no known signature; failed step: `Test webviews`
web / react-apps-check	unknown	no known signature; failed step: `Check webview test shards`

Not re-run automatically: web / react-apps-check (2), web / react-apps-check are not machine failures.

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.

github-actions · 2026-10-18T23:06:07Z

CI fast guards failed on 2d44aa34b1 (https://github.com/manaflow-ai/cmux/actions/runs/39176756551). It does not block the merge; a red guard merged into main breaks it for every open PR.
The log named no failed step; see the run.

Agents: python3 scripts/ci/guard_attribution.py fix applies the mechanical fixes locally. This comment is updated in place on each push.

The dots animate only while the agent works (data-working), so the loops fixture shows the working button. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

cursor · 2026-10-18T23:29:52Z

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github-actions · 2026-10-18T23:53:57Z

cmux-next tour of 2d44aa34b12e11a966088091b591e88733463c62 (run)

The tour job failed before the tour ran (build or setup); the run log has the output.

The tour produced no media.

_{Tours are data in scripts/cmux-next/media/tours: add a step or a tour file to show your feature.}

Review follow-up to #21800: a hidden button no longer keeps the dots' infinite animation running. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

#21879) #21800 started the dots' loop under .acpmux-jump-latest[data-shown][data-working], which outranks the static rule (:root[data-status-indicators=static] ... i), so with Static status indicators the three dots kept pulsing and static-status-loops.test.ts is red on feat-cmux-next. The static rule now repeats [data-shown][data-working] and wins. Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

github-actions · 2026-10-19T18:26:17Z

Shipped in:

cmux NEXT nightly 1.0.0-nightly.3929331184001 (83d36a611f)
cmux NEXT nightly 1.0.0-nightly.3930148023001 (9d185ebb26)

teamleaderleo added the media-tour Run the cmux-next UI tour (cmux-next-media.yml) on every push label Oct 18, 2026

webviews test: the Jump to latest dots loop while working

2d44aa3

The dots animate only while the agent works (data-working), so the loops fixture shows the working button. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

teamleaderleo merged commit 4de3b8c into feat-cmux-next Oct 19, 2026
103 of 108 checks passed

teamleaderleo deleted the feat/next-scroll-thinking-dots branch October 19, 2026 00:10

This was referenced Oct 19, 2026

cmux NEXT: smooth chat follow and Jump to latest; no caret once idle #20434

Closed

cmux NEXT: Jump to latest's dots pulse only while it shows #21861

Merged

This was referenced Oct 19, 2026

agent pane: a gallery stage in a chat loads live, at its own size #21872

Merged

cmux NEXT: static status indicators stop the Jump to latest dots again #21878

Closed

cmux NEXT: Static status indicators stop the Jump to latest dots again #21879

Merged

teamleaderleo mentioned this pull request Oct 22, 2026

cmux NEXT: status dots are still; a guard fails on any breathing or blinking dot in a web stylesheet #24057

Merged

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cmux NEXT: Jump to latest morphs into pulsing accent dots while the agent works - #21800

cmux NEXT: Jump to latest morphs into pulsing accent dots while the agent works#21800
teamleaderleo merged 2 commits into
feat-cmux-nextfrom
feat/next-scroll-thinking-dots

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