fix: pass existing backslash escapes through escape_content

[imphil]

escape_content had no case for backslash, so it escaped the backslash of an escape sequence that was already in the source: \] became \\], a literal backslash followed by a bare ] that closes the caller's content block early. Copy escape sequences through whole instead.

Summary by CodeRabbit

• Bug Fixes
  • Existing backslash escapes are now preserved during diff rendering instead of being escaped a second time.
  • Escaped characters such as \* and \[ now display correctly.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: af8b07df-653d-472d-931b-56d5c91db84f

📥 Commits

Reviewing files that changed from the base of the PR and between 8f7dedf and 949079b.

📒 Files selected for processing (2)

• src/render.rs
• tests/integration.rs

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The renderer now preserves existing backslash escape sequences during diff content escaping. Unit and integration tests verify that escaped brackets and asterisks are not double-escaped.

Changes

Escape Preservation

Layer / File(s)	Summary
Content escaping and regression coverage src/render.rs, tests/integration.rs	escape_content preserves existing backslash escape sequences. Unit and integration tests verify escaped brackets and asterisks remain unchanged.

Priority: ⬇️ Low

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

Change: Bug fix

Suggested reviewers: sou1118

Merge Risk: ⚪ Minimal · up to 94907

The renderer now preserves existing escapes without introducing a current merge-blocking risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: preserving existing backslash escapes in escape_content.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 2 files.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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