[Portland] [Bug 7582] New: xdg-su should not care if there is no GUI when being run as root.

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https://bugs.freedesktop.org/show_bug.cgi?id=7582          
     
           Summary: xdg-su should not care if there is no GUI when being run
                    as root.
           Product: Portland
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: xdg-utils
        AssignedTo: portland at lists.freedesktop.org
        ReportedBy: tom.whipple at intel.com


Suppose we are already root. Then,

# xdg-su -c whoami

Should simply print "root" without any difficulty. Instead,
Command (xdg-su -c whoami) gave exit code 3, expected 0
Incorrect output written to stdout, as shown below
expected stdout:root

Unexpected output written to stderr, as shown below:
stderr:xdg-su: no graphical method available for invoking 'whoami' as 'root'

See test case xdg-su/t.su_basic_asroot          
     
     
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