fix(grep): regroup definitions within each page

[dmtrKovalenko]

classify_definitions = true now uses one grep call and stably groups definitions before usages within the returned page, as in #905. The separate definition and usage scans are removed; explicit definition_only mode still filters declarations before pagination.

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Local native Neovim benchmark: fn across 2,000 Rust files with two matching lines each, returning 50 results. Medians from 100 warm, interleaved runs using the same release library; the before case uses the merged Lua search code.

Search	Files read for the first page	Median latency
Before: separate definition and usage scans	2,025	22.77 ms
After: classify and regroup the returned page	25	1.10 ms
Classification off	25	1.09 ms

Page boundaries and file cursors match classification-off. A later page can contain more definitions after an earlier page's usages. Files with both match types retain a header in each section, and the divider appears only on mixed pages.

Review fixes

Area	Change
Tests	Snapshots cover a page with definitions and usages for the top and bottom prompts.
Navigation	A snapshot moves the cursor across the divider and checks that the first usage is selected.

Core fix found by CI

Important

A replaced picker could install its bigram index into the picker that replaced it. After :cd (or content_search { cwd = ... }) while the old root was still building its index, grep in the new root used the old index and searched 0 files until the next rescan. The post-scan install now checks the scan's cancellation flag and base path, like the watcher install below it. scan::tests::replaced_picker_does_not_install_its_bigram_index_into_the_successor replays the interleaving and fails without the guard.

The bug exists on main. On CI it surfaced as the intermittent programmatic_search_spec ubuntu failure (filtered_file_count = 0 for the new root); the spec now prints the index state if it fails again.

Stack merge order: #924, #925, #927, #928, #930, #931, #932, #933, #934.

Summary by CodeRabbit

• Behavior Changes
  • With definition classification enabled, matching definitions appear before other matches within each grep results page. Results are grouped per page rather than collecting definitions across pages first.
  • Classification uses regular grep results without scanning ahead or searching files again for usages. Other search modes retain their existing ordering.
• Documentation
  • Clarified per-page classification behavior in the Neovim guidance and configuration comments.

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• crates/fff-core/src/scan.rs
• tests/programmatic_search_spec.lua

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📝 Walkthrough

Grep classification now uses one search per page. Definition matches appear before other matches within each page. The picker, native sorting, tests, snapshots, and documentation reflect this behavior.

Changes: Grep classification

Layer / File(s)	Summary
Single-search per-page classification lua/fff/picker_ui/grep_renderer.lua, crates/fff-nvim/src/lib.rs, lua/fff/conf.lua, README.md, doc/fff.nvim.txt	The picker makes one fuzzy.live_grep call for each classification mode. It no longer runs separate searches or encodes a section in the offset. Native results place definitions first in Classify mode. Comments and documentation describe grouping within each page.
Classification tests and picker snapshots tests/grep_classification_spec.lua, tests/picker_ui_snap.lua, tests/snapshot/fixture.lua, tests/screenshots/tests-picker_ui_snap.lua---grep_classify---*	Tests cover bridge arguments and return metadata, ordering across plain, regex, and fuzzy searches, page and per-file limits, cursors, and definition_only filtering. Picker snapshots cover mixed results and cursor movement across the divider. Fixtures accept additional files.

Post-scan index installation

Layer / File(s)	Summary
Guard index installation for replaced pickers crates/fff-core/src/scan.rs	Index installation checks cancellation and whether the picker’s base path matches the scan snapshot. A regression test replaces the picker during index construction and checks that grep finds a marker in the successor picker.

Cwd-switch search test

Layer / File(s)	Summary
Extend polling and add diagnostics tests/programmatic_search_spec.lua	The test polls for up to ten seconds. If it finds no match, it prints health-check, file-search, sandbox, base-path, and grep state.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant GrepRenderer
  participant FuzzyLiveGrep
  participant LiveGrepWithOptions
  GrepRenderer->>FuzzyLiveGrep: Query and classification options
  FuzzyLiveGrep->>LiveGrepWithOptions: Run grep with options
  LiveGrepWithOptions-->>FuzzyLiveGrep: Page with definitions first in Classify mode
  FuzzyLiveGrep-->>GrepRenderer: Page and file offset

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Merge Risk: ⚪ Minimal · up to 5ad62

The index-installation guard and cwd-switch test changes show no established issue requiring a fix before merge.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 54.55% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 8 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main grep change: regrouping definitions within each result page.

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @tests/grep_classification_spec.lua:
- Around line 1-3: Add a file-level Lua diagnostic disable for undefined-field
and missing-fields at the top of the grep classification spec, before the
require statements, so the test assertion helpers and partial vim.g.fff table
pass the language-server check.

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📒 Files selected for processing: 6

• README.md
• crates/fff-nvim/src/lib.rs
• doc/fff.nvim.txt
• lua/fff/conf.lua
• lua/fff/picker_ui/grep_renderer.lua
• tests/grep_classification_spec.lua

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