Update text formatting based on RangeSelection

[6peterlu]

Is it possible to apply formatting to portions of editor text parameterized by RangeSelections? If so, what is a simple way to do so?

I am trying to implement a basic comment system where I will create a data structure which maps RangeSelections to comment data. This means I would load the comment data and the editor separately, and would need to apply highlight formatting to the editor based on the comment data. I am roughly following the separate data structure pattern described in #1839.

Thanks so much!