Mike Fleetwood authored May 14, 2016 and Curtis Gedak committed May 20, 2016

Quoting the relevant comments from GParted_Core::calibrate_partition():
    Re-add the real partition path from libparted.

    When creating a copy operation by pasting into unallocated space the
    list of paths for the partition object was set to
    ["Copy of /dev/SRC"] because the partition didn't yet exist before
    the operations were applied.  Additional operations on that new
    partition also got the list of paths set to ["Copy of /dev/SRC"].
    This re-adds the real path to the start of the list making it
    ["/dev/NEW", "Copy of /dev/SRC"].  This provides the real path for
    file system specific tools used during those additional operations
    such mkfs for the format operation or fsck and others for the
    resize/move operation.

    FIXME: Having this work just because "/dev/NEW" happens to sort
    before "Copy of /dev/SRC" is ugly!  Probably have a separate display
    path which can be changed at will without affecting the list of real
    paths for the partition.

Having a separate display path is overly complicated and unnecessary.
Just replace the list of paths with the real one reported by libparted
if it contained "Copy of /dev/SRC", determined by checking if the file
exists.  Otherwise continue to add the libparted name as an alternate
path.  Whole disk devices can never be named "Copy of /dev/SRC" because
they are not partitioned so never created or deleted by GParted, only
ever written to, hence don't need the extra exists test logic.

Bug 766349 - Resolve code ugliness with partition path getting set to
             "copy of /dev/SRC"