String insertedText
If this change is a deletion, this string will be empty; otherwise, it'll be the text that should be ...
int length
If this change is a deletion, this specifies the number of characters to delete.
Calculates and applies a sequence of changes to convert one text string into another.
int start
Specifies the character index in a string at which text should be inserted or deleted.
Describes a change, which can be either an insertion or deletion.