Created by: thcipriani
- Modify check for scrollbar to account for IE10/11
- Stop static nav shift on modal open
- Fixes #9855 (closed)
Tested working:
- Debian 7/Iceweasel 17.0.10
- Debian 7/Chrome 32.0.1700.107
- Windows 7/IE 10
- Windows 7/Chrome 33
- OSX 10.9/Firefox 27.0.1