"Invert if" does not properly enclose an entire #region/#endregion

[bzd3y]

Version Used:
VS 17.10.1

Steps to Reproduce:

Add something like the following code to a program:

		public void SomeMethod()
		{
			object something = null;

			if (something == null)
			{
				return;
			}

			#region A region
			something = new object();
			#endregion
		}

And then use the "Invert if" refactor on the if statement.

Diagnostic Id:

I don't know the diagnostic id. I'm not 100% sure this refactor is part of this repository.

This also might be the case for other code block refactors.

Expected Behavior:

After the refactor the #endregion should be inside the if block.

Actual Behavior:

The refactor puts it outside the closing }.

[GiovanniBraconi]

I'm taking a look at this 😃