gitui does not offer to add files due to conflicting .gitignore files

**Describe the bug**
gitui does not offer to add files due to conflicting .gitignore files.

**To Reproduce**
Steps to reproduce the behavior:
1. Go into an empty folder
2. Follow these commands:
```bash
git init
mkdir -p directory/ignored
touch directory/ignored/file
echo "**/ignored" > .gitignore
echo "!ignored" > directory/.gitignore
```

**Expected behavior**
gitui should offer me to add the file with the path "directory/ignored/file" like git status shows me the directory with the files.

**Context (please complete the following information):**
- OS/Distro + Version: Ubuntu Mate 22.04.2 LTS
- GitUI Version: 0.22.1
- Rust version: 1.69

**Additional context**
Also I found this issue while working on a monorepo. When creating the test repo with the above reproduction steps above I actually couldn't reproduce the problem, because I also encountered another error, when starting gitui:

```bash
$ gitui
Error: receiving on an empty and disconnected channel
```

Would be nice if someone could try it out first. It should create the same problems like my monorepo, but confirmation would be helpful.