.gitignore: Support more IDEs?

[frederick-vs-ja]

In #4674, /.idea was accidently added to .gitignore and later removed.

Given there're already .vs/ and .vscode/, is it better to add support for other IDEs, like CLion, in .gitignore?

[AlexGuteniev]

That would feel like a set of poles with different country flags near a hotel.
I mean I like the idea.

[StephanTLavavej]

We talked about this at the weekly maintainer meeting and we have no strong feelings about this. If someone is regularly using a third-party IDE with the STL and would like to gitignore a settings directory for it, then we would review such a change, but we don't think it's necessary to add pre-emptively.