[Gtkradiant] [Bug 620] New: Add a Z Clipper tool like jk2 radiant

[gtkradiant@zerowing.idsoftware.com]

http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=620

           Summary: Add a Z Clipper tool like jk2 radiant
           Product: GtkRadiant
           Version: 1.3
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: editor
        AssignedTo: ttimo@idsoftware.com
        ReportedBy: jmonroe@ravensoft.com


this feature would allow you to move two brushes in the Z window to clip off 
any outlying brushes.  this is most useful on very tall, stacked levels where 
you would want to focus on a single level at a time.