Function changeLine

lib/web/CodeMirror/src/model/changes.js:332–339

(doc, handle, changeType, op)

// returning the number and optionally registering the line as
// changed.
export function changeLine(doc, handle, changeType, op) {
  let no = handle, line = handle
  if (typeof handle == "number") line = getLine(doc, clipLine(doc, handle))
  else no = lineNo(handle)
  if (no == null) return null
  if (op(line, no) && doc.cm) regLineChange(doc.cm, no, changeType)
  return line
}