fix: use numstat to filter whitespace-only changes with -W flag

[scolladon]

Explain your changes

---

Fixes regression introduced in commit 8244258 where the -W (ignore whitespace) flag incorrectly includes files with only whitespace changes in the delta package.

Root cause: git diff --name-status ignores whitespace flags for file reporting — a file with only whitespace changes still appears as M. The previous implementation (v6.19.0) used git diff --numstat with per-change-type queries, where whitespace flags cause such files to produce 0 0 stats and --diff-filter=M naturally excludes them.

Fix: Revert getDiffLines() from a single --name-status --diff-filter=AMD call to 3 sequential --numstat --diff-filter=X calls (one per change type: A, M, D). Output format (X\tpath) is unchanged — no downstream changes needed.

Additional improvement: Replaced all 5 push(...spread) occurrences across the codebase with a stack-safe pushAll utility to prevent potential RangeError on large arrays.

Does this close any currently open issues?

---

Nop

• Jest tests added to cover the fix.
• NUT tests added to cover the fix.
• E2E tests added to cover the fix.

Any particular element that can be tested locally

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Use -W flag with two commits where a file has only whitespace changes (e.g., a blank line removed). The file should NOT appear in the generated package.xml:

sf sgd source delta --from <commit-before> --to <commit-after> -W --output-dir output

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (f3fce5a) to head (8351325).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1217   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           57        58    +1     
  Lines         1528      1542   +14     
  Branches       194       194           
=========================================
+ Hits          1528      1542   +14     

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[github-actions]

Published under dev-1217 npm channel.

$ sf plugins install sf-git-merge-driver@dev-1217

[github-actions]

Shipped in release v6.32.2.
Version v6.32.2 will be assigned to the latest npm channel soon
Install it using either v6.32.2 or the latest-rc npm channel

$ sf plugins install sfdx-git-delta@latest-rc
# Or
$ sf plugins install sfdx-git-delta@v6.32.2

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