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Description of the bug

When setting --workdir <path> to the path of the repository or setting --workdir <parent-dir> to the parent of the repository: The git-cliff output is empty.

This used to work in 2.8.0. Maybe the meaning of --workdir changed related to some of the changes in the last few versions regarding --include-path, path resolution etc.

Steps To Reproduce

1. Setup the repository:

   mkdir git-cliff-workdir
   cd git-cliff-workdir/
   git init
   git commit -m "feat: Changelog entry" --allow-empty

2. These commands work as expected:

   # from inside git-cliff-workdir/
   # works
   git-cliff
   
   cd ..
   # works
   git-cliff --repository git-cliff-workdir

3. These however, output an empty changelog:

   # from inside git-cliff-workdir/
   git-cliff --workdir .
   cd ..
   # from the parent directory of git-cliff-workdir/
   git-cliff --workdir git-cliff-workdir/
   git-cliff --repository git-cliff-workdir --workdir ./

Expected behavior

git-cliff should output the same changelog as for the other two commands, so for the example above:

## [unreleased]

### 🚀 Features

- Changelog entry

Screenshots / Logs

> ./git-cliff-workdir-repro.sh
+ mkdir git-cliff-workdir
+ cd git-cliff-workdir/
+ git init
...
+ git commit -m 'feat: Changelog entry' --allow-empty
[master (root-commit) 927f9d3] feat: Changelog entry
+ git-cliff
 WARN  git_cliff > "cliff.toml" is not found, using the default configuration
## [unreleased]

### 🚀 Features

- Changelog entry
+ git-cliff --workdir .
 WARN  git_cliff > "./cliff.toml" is not found, using the default configuration
+ cd ..
+ git-cliff --repository git-cliff-workdir
 WARN  git_cliff > "cliff.toml" is not found, using the default configuration
## [unreleased]

### 🚀 Features

- Changelog entry
+ git-cliff --workdir git-cliff-workdir/
 WARN  git_cliff > "git-cliff-workdir/cliff.toml" is not found, using the default configuration
+ git-cliff --repository git-cliff-workdir --workdir ./
 WARN  git_cliff > "./cliff.toml" is not found, using the default configuration
+ rm -rf git-cliff-workdir/

Software information

• Project version: git-cliff 2.12.0

Additional context

Might be related to:

• 2.11.0
  • (args) Set the include-path if workdir is set (fix(args): set the include-path if workdir is set #1293) - (50b8312)
• 2.10.0
  • (config) Support using include and exclude paths in the config (feat: add include and exclude path to the config #1173) - (7c2f922)

After further investigation:

• Since setting --workdir now also sets the include path, empty commits without any file changes will be ignored.
• Absolute paths passed as --workdir are not handled properly. The include patterns themselves include the absolute path, while the path of the files itself are compared using the relative path in Repository::should_retain_commit.