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Description
- In addition to decorated symbols, it will also keep special marks, such as
thatMark,sourceMark, the previous location stack (Add proper "jump back" command #190), and bookmarks (Add "mark" action to bookmark a target #46) - If an action returns undefined for a mark, don't overwrite
- keep marks up to date
- should all marks be stacks?
- Also include previous edit ranges? How to avoid really large stack here?