Function setSimpleSelection

static/editor.md/lib/codemirror/lib/codemirror.js:2060–2062

(doc, anchor, head, options)

  // Reset the selection to a single range.
  function setSimpleSelection(doc, anchor, head, options) {
    setSelection(doc, simpleSelection(anchor, head), options);
  }

  // Give beforeSelectionChange handlers a change to influence a
  // selection update.