[0.10.10-insiders] Code folding for #region/#endregion

[daviwil]

It seems that #region/#endregion syntax in both PowerShell and C# isn't foldable in the 0.10.10-insiders release:

It seems that #if/#endif work fine though. What should our syntax definition files need to make these regions fold correctly?

[Tyriar]

This is blocked by #3422

[daviwil]

I apologize, I didn't read the release notes carefully enough. This is mentioned there already. I'll close this issue since it's already being tracked by #3422. Thanks!