Handle comments better when moving operators to the end of a line.

[eventualbuddha]

Closes #192

This is probably a poor implementation of a fix, but it seems to work. I'd appreciate pointers in how to make it better.

[shyiko]

Thank you both for the ticket and the PR, Brian.
I do appreciated the effort.

Having said that, I made an alternative fix (which avoids including operator in PsiWhiteSpaceImpl (this could lead to hard to debug problems when combined with other rules mutating the AST) + fixes a similar issue when moving operators to the next line) in 953d6b0. I hope you don't mind.

Fix available in ktlint@0.22.0.

Thanks again 🍻

[eventualbuddha]

I don’t mind at all! I figured my approach wouldn’t be optimal since I don’t have all the context for the project. Thanks for the fix!