[GL3+] Use the content rect for sizing the OS X view to fix clipping under the title bar.
[GL3+] Use the content rect for sizing the OS X view to fix clipping under the title bar.

OGRECave/ogre,OGRECave/ogre,paroj/ogre,RealityFactory/ogre,RealityFactory/ogre,RealityFactory/ogre,OGRECave/ogre,RealityFactory/ogre,paroj/ogre,OGRECave/ogre,paroj/ogre,paroj/ogre,OGRECave/ogre,paroj/ogre,RealityFactory/ogre