Function countOldContentLines

core/nextEdit/diff/diff.ts:348–360

* Count the number of lines in the old content (excluding "new" lines).

(
  diffLines: DiffLine[],
  startIdx: number,
  endIdx: number,
)

 * Count the number of lines in the old content (excluding "new" lines).
 */
function countOldContentLines(
  diffLines: DiffLine[],
  startIdx: number,
  endIdx: number,
): number {
  let count = 0;
  for (let i = startIdx; i <= endIdx; i++) {
    if (diffLines[i].type !== "new") {
      count++;
    }
  }
  return count;
}

/**
 * Process a changed area with a limited group size.