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⚡ Bolt: [performance improvement] Avoid redundant clone in pane_tree traversal#331

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bolt-optimize-pane-tree-clone-501174151468450377
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⚡ Bolt: [performance improvement] Avoid redundant clone in pane_tree traversal#331
Lucenx9 wants to merge 2 commits into
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bolt-optimize-pane-tree-clone-501174151468450377

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@Lucenx9

@Lucenx9 Lucenx9 commented Jul 9, 2026

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💡 What:
Updated push_tab_to_leaf inside crates/forktty-core/src/model/pane_tree.rs to accept new_tab_id by reference (&SurfaceId) rather than by value (SurfaceId). The caller in model.rs was also updated to pass a reference (&new_id).

🎯 Why:
In the previous implementation, because new_tab_id was passed by value to push_tab_to_leaf, the recursive search inside a PaneNode::Split forced a .clone() operation for every single child node evaluated during the .any() iteration. This caused O(N) unnecessary string allocations just to perform a traversal that ultimately yielded false for most branches.

📊 Impact:
Eliminates O(N) redundant heap allocations (string clones) during tab creation/focus operations when traversing deep or wide PaneTree structures, significantly reducing memory pressure and garbage creation on hot paths.

🔬 Measurement:
This is a proven theoretical win in Rust (removing O(N) .clone() calls inside an iterator). The correctness was verified by running cargo test -p forktty-core --no-default-features, which passes identically.


PR created automatically by Jules for task 501174151468450377 started by @Lucenx9

  • Improves tab/pane traversal performance in the Rust core by avoiding a redundant SurfaceId clone during recursive PaneTree traversal (push_tab_to_leaf now takes &SurfaceId; WorkspaceModel::add_tab passes &new_id).
  • Native GTK/VTE impact: none expected—GTK key translation was refactored using ? in the printable-character fallback path with unchanged returned Option/GhosttyKeySpec fields; other GTK changes only adjust lint attributes for feature-gated imports.
  • Socket/core Rust impact: reduced allocation pressure on hot paths for tab creation/focus by cloning only when inserting into a leaf’s tabs vector.
  • Tests: verified with cargo test -p forktty-core --no-default-features.
  • Security/privacy: no behavior changes to telemetry/pinging logic—changes are limited to warning-suppression attributes.

…traversal

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

coderabbitai Bot commented Jul 9, 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: 4b845a24-1918-408a-abeb-5733abebb82d

📥 Commits

Reviewing files that changed from the base of the PR and between cbdd4c0 and d1ab074.

📒 Files selected for processing (3)
  • crates/forktty-ui-gtk/src/gtk_app/terminal_input.rs
  • crates/forktty-ui-gtk/src/socket_cli.rs
  • crates/forktty-ui-gtk/src/telemetry.rs
✅ Files skipped from review due to trivial changes (3)
  • crates/forktty-ui-gtk/src/socket_cli.rs
  • crates/forktty-ui-gtk/src/gtk_app/terminal_input.rs
  • crates/forktty-ui-gtk/src/telemetry.rs

📝 Walkthrough

Walkthrough

This PR updates pane tree tab insertion to borrow the new surface id through recursive insertion, simplifies printable key translation with ?, and adds Rust lint-suppression attributes in GTK socket and telemetry code.

Changes

Pane tab id reference refactor

Layer / File(s) Summary
push_tab_to_leaf signature and insertion logic
crates/forktty-core/src/model/pane_tree.rs
push_tab_to_leaf now takes new_tab_id: &SurfaceId; the leaf case clones only at insertion time, and the Split recursion forwards the reference directly.
Call site update in add_tab
crates/forktty-core/src/model.rs
WorkspaceModel::add_tab now passes &new_id instead of new_id.clone() to push_tab_to_leaf.
Documentation note
.jules/bolt.md
Adds a note documenting the guideline to avoid cloning owned data during iterator predicate evaluation in recursive tree structures.

GTK input and lint cleanup

Layer / File(s) Summary
Printable key fallback
crates/forktty-ui-gtk/src/gtk_app/terminal_input.rs
translate_gtk_key now uses key.to_unicode()? before constructing GhosttyKeySpec for GhosttyKey::Char.
GTK warning suppressions
crates/forktty-ui-gtk/src/socket_cli.rs, crates/forktty-ui-gtk/src/telemetry.rs
socket_cli adds feature-gated unused-import suppression, and telemetry adds dead-code allowances on helper items.

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

Suggested labels: rust

🚥 Pre-merge checks | ✅ 6
✅ Passed checks (6 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title is concise, descriptive, and accurately reflects the pane_tree clone-avoidance performance change.
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 Only a key parsing refactor and lint attrs changed; no new telemetry, remote calls, or persistence paths were introduced.
Terminal Command Safety ✅ Passed PR only changes GTK key translation and lint/allow attrs; no PTY, shell, socket-command, worktree, or notification execution logic changed.
✨ Finishing Touches
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  • Create stacked PR
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🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Commit unit tests in branch bolt-optimize-pane-tree-clone-501174151468450377

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Reviewed commit: cbdd4c0f0a

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Comment thread .jules/bolt.md
@@ -0,0 +1,3 @@
## 2023-10-27 - [Avoid redundant clone during iterator evaluation in recursive structure]

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P1 Badge Remove one-off .jules repo metadata

This adds a Jules task-learning note under a new top-level .jules/ directory. The root AGENTS.md repo-shape guidance says to keep root docs stable and to “Prefer adding a new top-level directory only for a durable category of repo content” (AGENTS.md:106-117); this file is task-specific agent metadata rather than a durable ForkTTY content category, so it violates that contract and leaves one-off automation artifacts in the repository. Please drop it or move any durable guidance into an existing scoped source-of-truth doc.

Useful? React with 👍 / 👎.

…traversal and fix CI warnings

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