Support path-based filtering in Comments view

[Copilot]

The Comments view filter only matched against filenames, preventing users from disambiguating files with identical names in different directories. Filtering for src/sentinel.c would fail even when comments existed in that specific file.

Changes

Filter logic enhancement (commentsTreeViewer.ts)

• Try basename match first (preserves existing behavior)
• Fall back to full path match if basename doesn't match
• Enables filtering by patterns like src/sentinel.c, lib/package.json, etc.

// Before: only matched filename
const uriMatches = FilterOptions._filter(filterText, basename(resource));

// After: matches filename OR path
let uriMatches = FilterOptions._filter(filterText, basename(resource));
if (!uriMatches) {
    uriMatches = FilterOptions._filter(filterText, resource.path);
}

Test coverage (commentsView.test.ts)

• Verify src/sentinel.c filters to single file in src/ directory
• Verify sentinel.c still matches all files named sentinel.c (backward compatibility)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Filter comments only accepts filenames and not repo relative paths</issue_title>
<issue_description>
Type: Bug

1. Clone https://github.com/valkey-io/valkey
2. Open it in VS code
3. Switch to the GitHub Pull Requests sidebar
4. Expand the pull request Spelling valkey-io/valkey#2183 (for me it's in Created By Me, but you can use All Open or create a filter for this PR)
5. Click on the pull request (?) to try to get the comments area to appear below showing ~122 comments
6. type src/sentinel.c into the filter box expecting to see the file
   

Note that it's perfectly reasonable for multiple files by the same name to exist in a repository (Makefile, README.md, package.json) and it's quite likely that a user will only care about a specific one even if there are multiple files by that name with comments.

Extension version: 0.113.2025062009
VS Code version: Code 1.101.1 (Universal) (18e3a1e, 2025-06-18T13:35:12.605Z)
OS version: Darwin arm64 24.5.0
Modes:

System Info

Item	Value
CPUs	Apple M1 Max (10 x 2400)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: enabled_on video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	41, 31, 24
Memory (System)	64.00GB (0.27GB free)
Process Argv	--crash-reporter-id 1fc67ee2-0174-4598-9f98-4537df0dd32c
Screen Reader	no
VM	0%

A/B Experiments

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7bj51361:31289155
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convertfstringf:31295003

Comments on the Issue (you are @copilot in this section)

• Fixes Filter comments only accepts filenames and not repo relative paths #254632

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