Update .gitignore to include cache and dump files

[jtschuster]

Add patterns to ignore C# Dev Kit caches and dump files.

The Dev Kit extension now creates .lscache files for each csproj loaded by the lsp. We should tell git to ignore them

Also ignore dump files because I imagine people often have them in the directory but never want to commit them.

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This review was generated by Copilot.

🤖 Copilot Code Review — PR #126718

Holistic Assessment

Motivation: Justified — .lscache (C# Dev Kit), .dmp, and .dump files are common development/debugging artifacts that should not be committed. This is a quality-of-life improvement for contributors using VS Code with C# Dev Kit and anyone generating crash/memory dumps locally.

Approach: Correct — adding glob patterns to .gitignore is the standard approach. The entries are placed logically after the existing VS Code section, which makes sense since C# Dev Kit is a VS Code extension.

Summary: ✅ LGTM. This is a small, safe, well-placed addition to .gitignore. No existing tracked files match the new patterns, and the glob patterns are appropriately scoped. No code changes, no build/test impact.

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Detailed Findings

✅ Correctness — No tracked files affected

Verified via git ls-files '*.lscache' '*.dmp' '*.dump' that no existing tracked files match these patterns. The new entries will only affect future untracked files.

✅ Placement — Logically organized

The .lscache entry is placed immediately after the VS Code section (.vscode entries), which is appropriate since C# Dev Kit is a VS Code extension. The dump file entries are grouped together with a clear comment. Both new blocks are between the VS Code and MonoDevelop sections, maintaining the file's organizational structure.

✅ Pattern scope — Appropriately broad

• *.lscache is specific to C# Dev Kit language server caches.
• *.dmp and *.dump are standard dump file extensions. While broad, these are universally recognized as debug/crash artifacts and the repo has no legitimate use of these extensions (no tracked files match). This is consistent with other broad patterns already in the file (e.g., *.log, *.tmp, *.pdb).

Generated by Code Review for issue #126718 · ◷