Ignored files list view, and ability to "unexclude" files

[AndrewStopchenko-SO]

Is your feature request related to a problem? Please describe.

Please see related discussion #5840.

Currently from the Files panel, we can ignore (<i>) the file in two ways:

1. add file to .gitignore (<i>)
2. add file to the .git/info/exclude (<e>)

For option1, .gitignore files are usually tracked in the project, and thus ignoring the file, we see the .gitignore as modified. Also, .gitignore is the natural "go-to" when looking for the currently ignored patterns.

But with option2, that .git/info/exclude file is stored inside the internal Git's folder - to be honest, I found out about that additional ignore file only thanks to the Lazygit!
Another problem is that, since that file is somewhere inside the .git/ folder's inners, it is easy to miss that extra place when searching for ignored patterns.

As a result, after the file is excluded (<i><e>), it becomes nontrivial to "unexclude" it.

Describe the solution you'd like

• It would be nice to have a view with a listing of currently ignored files and/or patterns.
  • If that listing of ignored files could also reveal the "ignore source" (gitignore vs exclude), that would be wonderful.
• It would be super-helpful if we could have a keybinding that allows editing the .gitignore or .git/info/exclude ignore files, respectively; I imagine something similar to how we currently edit the conflicted files (<e>), and then return to Lazygit after exiting the editor.

Describe alternatives you've considered

• for viewing the ignored file + ignore source, as suggested in Seeing the ignored files list / "unignore" #5840: git ls-files --others --ignored --exclude-standard | git check-ignore --stdin -v
• It seems like custom commands might be added to open this or that ignore file? Not sure, I did not create custom Lazygit commands before.