Disable line measuring subdivision hack (#990) on IE7

It completely screws up bounding rects when this is enabled.

Author: marijnh

lib/codemirror.js

@@ -885,7 +885,7 @@ window.CodeMirror = (function() {
     // doesn't work when wrapping is on, but in that case the
     // situation is slightly better, since IE does cache line-wrapping
     // information and only recomputes per-line.
-    if (ie && !cm.options.lineWrapping && pre.childNodes.length > 100) {
+    if (ie && !ie_lt8 && !cm.options.lineWrapping && pre.childNodes.length > 100) {
       var fragment = document.createDocumentFragment();
       var chunk = 10, n = pre.childNodes.length;
       for (var i = 0, chunks = Math.ceil(n / chunk); i < chunks; ++i) {