Minor rebase to remove Arabic textnode

Author: paulmasson

lib/codemirror.js

@@ -8558,8 +8558,9 @@
     if (badBidiRects != null) return badBidiRects;
     var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
     var r0 = range(txt, 0, 1).getBoundingClientRect();
-    if (!r0 || r0.left == r0.right) return false; // Safari returns null in some cases (#2780)
     var r1 = range(txt, 1, 2).getBoundingClientRect();
+    removeChildren(measure);
+    if (!r0 || r0.left == r0.right) return false; // Safari returns null in some cases (#2780)
     return badBidiRects = (r1.right - r0.right < 3);
   }