Update codeit.js

Author: benhatsor

lib/codeit.js

@@ -152,6 +152,7 @@ class CodeitElement extends HTMLElement {
         // if text is big, highlight cursor node first,
         // then highlight rest of codeit when finished typing
         if (cd.textContent.length > 5000 &&
+            window.getSelection().type !== 'None' &&
             document.activeElement === cd) {
 
           // get caret pos in text