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Re:A glance into web tech-based text editors’ text management by tbirdz on Friday November 11, 2016 @01:56AM (#12928581)
If you are interested in this kind of stuff, Craig Finseth's The Craft of Text Editing is a great read: https://www.finseth.com/craft/
Re:A glance into web tech-based text editors’ text management by gbrown_ on Friday November 11, 2016 @05:11AM (#12929368)
That will make a good weekend read thanks! Others may be interested in Data Structures for Text Sequences by Charles Crowley[0] which describes Piece Tables. This is the basis for the Vis editor[1].

[0]https://www.cs.unm.edu/~crowley/papers/sds.pdf

[1]https://github.com/martanne/vis