d6d59134788949e6256d2b3583f69b8311c9a0f9 Fix: When scrolling is enabled, a table redraw would shift the scrolling position by the height of the number of grouping rows above the viewport.

This is a really odd one and the browser isn't behaving like I would
have expected (details in the comment added in the code), but it is
consistent between FF and Chrome, so I guess that's how it is!

Sync to source repo @d6d59134788949e6256d2b3583f69b8311c9a0f9

Author: dtbuild

datatables.json

@@ -14,5 +14,5 @@
     ],
     "src-repo": "http://github.com/DataTables/RowGroup",
     "last-tag": "1.5.1",
-    "last-sync": "d56a83b4610167b172c8b3afa2bb8dc0cb836bb8"
+    "last-sync": "d6d59134788949e6256d2b3583f69b8311c9a0f9"
 }