make sure objects dragged into the viewport are not hidden.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54897 954f8c5b-7b00-dc11-b283-0030488c597c
enable grabbing for 2d view zooming, good for the graph editor.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54898 954f8c5b-7b00-dc11-b283-0030488c597c