[Gtkradiant] [Bug 945] New: Disable mouse-chase scrolling in XY window when drag-selecting

[gtkradiant@zerowing.idsoftware.com]

http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=945

           Summary: Disable mouse-chase scrolling in XY window when drag-
                    selecting
           Product: GtkRadiant
           Version: 1.5
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: editor
        AssignedTo: ttimo@idsoftware.com
        ReportedBy: wjoseph@europe.ea.com


Mouse chaser makes it hard to drag-select things at the edge of the screen.
Currently, mouse-chaser is activated if any button is held down - we should 
make this only occur during manipulator-drags.