.idea folder stops folding as soon as the .gitignore file is added to git tracking

[yuiidev]

For some reason, the .idea folder stops tracking as soon as you add it to the git tracking.
When you right click the .idea folder and click "Add to .gitignore" the .idea folder gets folded no problem, when you then click on "add" in the pop-up because you've created a new file that isn't tracked, the .idea folder stops folding.

I should clarify that the target folder for example, remains folded without issue.