Function regLineChange

lib/web/CodeMirror/src/display/view_tracking.js:78–89

(cm, line, type)

// Register a change to a single line. Type must be one of "text",
// "gutter", "class", "widget"
export function regLineChange(cm, line, type) {
  cm.curOp.viewChanged = true
  let display = cm.display, ext = cm.display.externalMeasured
  if (ext && line >= ext.lineN && line < ext.lineN + ext.size)
    display.externalMeasured = null

  if (line < display.viewFrom || line >= display.viewTo) return
  let lineView = display.view[findViewIndex(cm, line)]
  if (lineView.node == null) return
  let arr = lineView.changes || (lineView.changes = [])
  if (indexOf(arr, type) == -1) arr.push(type)
}

// Clear the view.
export function resetView(cm) {