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2546741d1b
Problem:
A mark moved by nvim_buf_set_extmark() during an edit is misplaced by
undo and redo. Only splices ("edits") are recorded, and replaying them
reproduces the shifts they caused, never the explicit set: the mark ends
up wherever the text pushed it.
Solution:
When an open undo block moves an existing mark, record both positions.
Undo restores the pre-set position, redo re-applies the set.
Partially reverts 18334a4a0c ; ExtmarkSavePos.row/col were unused
because nothing recorded an explicit move, but now `extmark_set()` does.