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⚡ Bolt: [performance improvement] - #375

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bolt-perf-pane-tree-allocation-17055342990971991722
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⚡ Bolt: [performance improvement]#375
Lucenx9 wants to merge 1 commit into
mainfrom
bolt-perf-pane-tree-allocation-17055342990971991722

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@Lucenx9

@Lucenx9 Lucenx9 commented Jul 26, 2026

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💡 What: Changed the signature of push_tab_to_leaf to return Result<(), SurfaceId> instead of bool. This allows the function to take ownership of new_tab_id and pass it back out on failure instead of eagerly cloning it on every recursive iteration inside the .any() closure.
🎯 Why: Calling .clone() inside a loop for recursive tree searches causes O(N) unnecessary heap allocations, degrading performance.
📊 Impact: Completely eliminates string cloning during push_tab_to_leaf calls.
🔬 Measurement: Verified with cargo test -p forktty-core --no-default-features. Code structure is fundamentally cleaner without clone() operations in the inner loop.


PR created automatically by Jules for task 17055342990971991722 started by @Lucenx9

Summary

  • Optimizes recursive tab insertion by transferring SurfaceId ownership instead of cloning during tree traversal.
  • Updates failure handling to return the unconsumed tab ID via Result.

Testing

  • cargo test -p forktty-core --no-default-features

Impact

  • Core Rust change only; no user-visible behavior changes.
  • No GTK/VTE or socket changes.
  • No security or privacy impact.

Eliminated redundant `O(N)` string allocations during pane tree traversal.
By changing `push_tab_to_leaf` to return a `Result<(), SurfaceId>`,
the recursive loop can safely consume ownership of the string on match,
or return it on miss to be reused by the next iteration without cloning.

Co-authored-by: Lucenx9 <185146821+Lucenx9@users.noreply.github.com>
@google-labs-jules

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@coderabbitai

coderabbitai Bot commented Jul 26, 2026

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Review Change Stack

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: efd66a8a-b426-49a3-b532-ffceff655ace

📥 Commits

Reviewing files that changed from the base of the PR and between e6b0e87 and 5be73ec.

📒 Files selected for processing (3)
  • .jules/bolt.md
  • crates/forktty-core/src/model.rs
  • crates/forktty-core/src/model/pane_tree.rs

📝 Walkthrough

Walkthrough

The pane-tree tab insertion helper now returns Result<(), SurfaceId> and moves the identifier through recursive traversal without cloning. WorkspaceModel::add_tab handles the new result, while .jules/bolt.md records the optimization.

Changes

Tab insertion traversal

Layer / File(s) Summary
Result-based pane traversal
crates/forktty-core/src/model/pane_tree.rs
push_tab_to_leaf returns Ok(()) after insertion or Err(new_tab_id) when no matching leaf is found, passing ownership through recursive traversal.
Caller handling and optimization note
crates/forktty-core/src/model.rs, .jules/bolt.md
WorkspaceModel::add_tab checks .is_err(), and the optimization note documents avoiding eager SurfaceId cloning.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

Suggested labels: rust

🚥 Pre-merge checks | ✅ 5 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name Status Explanation Resolution
Title check ❓ Inconclusive The title is too generic and does not describe the actual Rust tree-traversal optimization. Rename it to describe the affected area and change, such as a Rust performance improvement in pane tree traversal.
✅ Passed checks (5 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
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.
Privacy Boundary ✅ Passed The changed code only rewires in-memory pane-tree/tab management; no new telemetry, network, or persistence calls were added, and local session state handling is unchanged.
Terminal Command Safety ✅ Passed No PTY/socket/worktree/shell/notification exec paths changed; only pane-tree ownership flow and add_tab call site were modified.
✨ 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 bolt-perf-pane-tree-allocation-17055342990971991722

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Reviewed commit: 5be73ecbba

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Comment thread .jules/bolt.md
@@ -0,0 +1,3 @@
## 2024-07-26 - [Performance Optimization] Avoid eager allocations inside iterator closures during tree traversal

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P2 Badge Remove the one-off Bolt note from the repository root

This task log is not consumed by code or tooling—repo-wide search finds no references—and it re-creates .jules/bolt.md, which the existing CHANGELOG.md explicitly records as a stale note that was removed. Keeping it introduces a bot-specific top-level content category for a single implementation detail; remove it rather than expanding the repository shape against the documented root-layout contract.

AGENTS.md reference: AGENTS.md:L131-L131

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