Function transform_position 

pub fn transform_position(pos: Position, against: &Edit) -> Position

Transform a position through the effect of an edit.

This is the OT inclusion transformation (IT): given a position pos in the buffer state before against was applied, returns the equivalent position in the buffer state after against.

Tie-breaking (same-position edits)

Uses left-bias convention: when pos equals the edit position, an Insert shifts pos right (the insert “happened before” our position), while a Delete leaves pos unchanged (pos <= del_pos → no shift).

Character counting

All column arithmetic uses Unicode scalar values (.chars().count()), consistent with Position::column semantics.

Example

use reovim_kernel::api::v1::*;

// Insert "abc" at (0,2) shifts position (0,5) to (0,8)
let pos = transform_position(
    Position::new(0, 5),
    &Edit::insert(Position::new(0, 2), "abc"),
);
assert_eq!(pos, Position::new(0, 8));