What I would like is something like ":sort iu"
but the opposite, to keep only one copy of the duplicate lines.
" -------1---------2---------3---------4---------5---------6----
This seems to work, but is not elegant:
" clear the a register
qaq
" search and copy all duplicate lines
:g/\(^.\+\n\)\1/y A
" open a new buffer, paste contents of register a
"aP
" sort removing duplicate lines
:sort iu
" -------1---------2---------3---------4---------5---------6----
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