Work around IE getBoundingClientRect bug

In some modes, when querying a visibility: hidden node inside of an iframe,
IE8 and 9 will return nonsense coordinates.

Author: marijnh

lib/codemirror.js

@@ -756,6 +756,8 @@ var CodeMirror = (function() {
     function scrollEditorIntoView() {
       if (!cursor.getBoundingClientRect) return;
       var rect = cursor.getBoundingClientRect();
+      // IE returns bogus coordinates when the instance sits inside of an iframe and the cursor is hidden
+      if (ie && rect.top == rect.bottom) return;
       var winH = window.innerHeight || Math.max(document.body.offsetHeight, document.documentElement.offsetHeight);
       if (rect.top < 0 || rect.bottom > winH) cursor.scrollIntoView();
     }