Update Bonsplit selected tab separator

[lawrencecchen]

Summary\n- update Bonsplit to include the selected-tab left separator trim from https://github.com/manaflow-ai/bonsplit/pull/112\n- keeps the selected tab's left separator pinned to the top while leaving a one-point gap at the bottom corner\n\n## Tests\n- cd vendor/bonsplit && swift test\n- ./scripts/reload.sh --tag tabedge

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Summary by cubic

Updates vendored bonsplit to include the selected-tab left separator trim for cleaner tab edges. Keeps the selected tab’s left separator pinned to the top with a 1pt gap at the bottom corner.

^{Written for commit a56f8bc. Summary will update on new commits. Review in cubic}

Summary by CodeRabbit

• Chores
  • Updated vendor dependency to the latest version.

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Project	Deployment	Actions	Updated (UTC)
cmux	Ready	Preview, Comment	Apr 30, 2026 11:00am
cmux-staging	Building	Preview, Comment	Apr 30, 2026 11:00am

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request updates the Git submodule pointer for vendor/bonsplit from commit hash 84e5bd57... to 1babedfe.... No source code, logic, or configuration changes are introduced; only the vendored dependency reference is advanced.

Changes

Cohort / File(s)	Summary
Submodule Reference Update vendor/bonsplit	Git submodule commit hash updated to pull in upstream changes from the bonsplit dependency.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Fix split transparency regression #1568: Also updates the vendor/bonsplit submodule pointer to track upstream changes.
• Add hover tooltips to workspace and pane tabs #3329: Similarly modifies the vendor/bonsplit Git submodule commit reference.
• Fix Bonsplit tab bar height #3331: Updates the vendor/bonsplit submodule pointer, advancing the vendored bonsplit commit.

Poem

🐰 A hop, a skip, a submodule's leap,
Bonsplit's pointer marches deep,
From one hash home to another we bound,
Keeping vendors fresh and sound! 🌱

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: updating Bonsplit and specifically addressing the selected tab separator, which is the core focus of the PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The PR description adequately covers the summary of changes and testing approach, addressing key template sections.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch task-fix-bonsplit-selected-tab-left-border

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[greptile-apps]

Greptile Summary

This PR bumps the vendor/bonsplit submodule pointer to pick up the selected-tab left-separator trim from bonsplit PR #112, which keeps the left separator pinned to the top with a one-point gap at the bottom corner.

• The new submodule commit (1babedfe) is sourced from an open PR branch in the bonsplit repo. Per the project's submodule safety policy, it must land on origin/main of that repo before the parent pointer is updated, otherwise the commit is orphaned when the feature branch is deleted.

Confidence Score: 3/5

Hold until bonsplit PR #112 is confirmed merged to origin/main — the submodule commit could otherwise be orphaned.

Single P1: the submodule commit may not yet be reachable from bonsplit's main branch, violating the explicit submodule safety policy in CLAUDE.md. If the commit is already on main the change is otherwise trivial and safe.

vendor/bonsplit — verify new commit is on origin/main of the bonsplit remote before merging.

Important Files Changed

Filename	Overview
vendor/bonsplit	Submodule pointer bumped from 84e5bd5 to 1babedf; need to confirm the new commit is on bonsplit's origin/main to avoid orphaning.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[bonsplit PR #112] -->|merge to main?| B{Commit on origin/main?}
    B -- Yes --> C[Update vendor/bonsplit pointer in cmux]
    B -- No --> D[Orphaned commit — branch deletion loses it]
    C --> E[PR safe to merge]
    D --> F[Do NOT merge — push to bonsplit main first]

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_{Reviews (1): Last reviewed commit: "Update Bonsplit selected tab separator" | Re-trigger Greptile}

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