Function makeChangeSingleDocInEditor

external/.scrollLibs.js:7336–7406

(cm, change, spans)

  // Handle the interaction of a change to a document with the editor
  // that this document is part of.
  function makeChangeSingleDocInEditor(cm, change, spans) {
    var doc = cm.doc,
      display = cm.display,
      from = change.from,
      to = change.to

    var recomputeMaxLength = false,
      checkWidthStart = from.line
    if (!cm.options.lineWrapping) {
      checkWidthStart = lineNo(visualLine(getLine(doc, from.line)))
      doc.iter(checkWidthStart, to.line + 1, function (line) {
        if (line == display.maxLine) {
          recomputeMaxLength = true
          return true
        }
      })
    }

    if (doc.sel.contains(change.from, change.to) > -1) {
      signalCursorActivity(cm)
    }

    updateDoc(doc, change, spans, estimateHeight(cm))

    if (!cm.options.lineWrapping) {
      doc.iter(checkWidthStart, from.line + change.text.length, function (line) {
        var len = lineLength(line)
        if (len > display.maxLineLength) {
          display.maxLine = line
          display.maxLineLength = len
          display.maxLineChanged = true
          recomputeMaxLength = false
        }
      })
      if (recomputeMaxLength) {
        cm.curOp.updateMaxLine = true
      }
    }

    retreatFrontier(doc, from.line)
    startWorker(cm, 400)

    var lendiff = change.text.length - (to.line - from.line) - 1
    // Remember that these lines changed, for updating the display
    if (change.full) {
      regChange(cm)
    } else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change)) {
      regLineChange(cm, from.line, "text")
    } else {
      regChange(cm, from.line, to.line + 1, lendiff)
    }

    var changesHandler = hasHandler(cm, "changes"),
      changeHandler = hasHandler(cm, "change")
    if (changeHandler || changesHandler) {
      var obj = {
        from: from,
        to: to,