Files in directories with whitelist-style .gitignore are hidden

Consider the .gitignore:

# Ignore everything, but not directories:

*
!**/

# Except the following file types:

!.gitignore

!**.txt
!**.md

Broot doesn't show any file in the directory with such .gitignore:

ls -a
.  ..  credits.txt  .git  .gitignore  Readme.md

BROOT_LOG=debug br
/home/allkromm/src/bugs/broot-gitignore

mv .gitignore ..

BROOT_LOG=debug br
/home/allkromm/src/bugs/broot-gitignore
 ├──broot.log 
 ├──credits.txt 
 └──Readme.md 

Steps to reproduce the behavior:

1. Open a directory with git repository and gitignore like described above (minimal example attached);
2. Launch Broot;
3. Type pt;

Expected behavior: credits.txt and Readme.md files are displayed. Actual behavior: they are not displayed.

Files are displayed if .gitignore file is removed from the directory, or if gi flag is no.

• broot version: broot 1.6.3
• OS: Debian
• Version: 11.0

broot.log
broot-gitignore.zip

There is a mention of whitelist-style .gitignore files here: https://github.com/Canop/broot/issues/35#issuecomment-753346679

Start with the attached broot-gitignore.zip and reproduce the case using the shown whitelist-style .gitignore, BROOT_LOG=debug br, and the pt command. Compare filtering with and without the gi flag; done means credits.txt and Readme.md are displayed while the gitignore behavior remains supported.