Today one of my project’s .gitignore did not work.

I was terrified, googled and found a solution to fix this :)

 git rm -r --cached .

This removes everything from the index, then just run:

 git add .

Commit it:

git commit -m ".gitignore is now working"

And these actions beautifully fix the broken .ignore

Be aware to commit all your changes before, otherwise you will loose control on all the changed files

(Source: stackoverflow.com)