fix: preserve LESS options in enter pager

[wfxr]

Check list

• I have performed a self-review of my code
• I have commented my code in hard-to-understand areas
• I have added unit tests for my code
• I have made corresponding changes to the documentation

Description

Preserve user-defined LESS options when opening the full-screen Enter pager. Like Git, forgit now honors an existing LESS value rather than replacing it; the required color and stay-open behavior is expressed through command-line options.

Add regression coverage for inherited LESS options and document the default FORGIT_ENTER_PAGER behavior.

Fixes #538.

Type of change

• Bug fix
• New feature
• Refactor
• Breaking change
• Test
• Documentation change
• CI change

Test environment

• Shell
  • bash
  • zsh
  • fish
• OS
  • Linux
  • Mac OS X
  • Windows
  • Others:

Additional verification: lib/bashunit tests (74 tests, 123 assertions), shfmt, Bash syntax check, rumdl, and ShellCheck 0.11.0 with the repository's pre-existing SC2218 findings excluded.

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 5cff30fc-b0b8-447f-afec-9cb51a38ebdc

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}