Function regLineChange

external/.scrollLibs.js:5657–5676

(cm, line, type)

  // Register a change to a single line. Type must be one of "text",
  // "gutter", "class", "widget"
  function regLineChange(cm, line, type) {
    cm.curOp.viewChanged = true
    var 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
    }
    var lineView = display.view[findViewIndex(cm, line)]
    if (lineView.node == null) {
      return
    }
    var arr = lineView.changes || (lineView.changes = [])
    if (indexOf(arr, type) == -1) {
      arr.push(type)
    }
  }

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