3.1. Prerequisite: Marking Files (The ``mf'' Command)

``One may mark files with the cursor atop a filename and then pressing "mf".
With gvim, one may also mark files with <s-leftmouse>.''

	-- Netrw Reference Manual (pi_netrw.txt)

There is an interesting piece of code in the s:NetrwMarkFile() function, which
is probably not exploitable (s:netrwmarkfilemtch_{curbufnr} is derived from the
file name):

        3790   " set up 2match'ing to netrwmarkfilemtch list
        3791   if exists("s:netrwmarkfilemtch_{curbufnr}") && s:netrwmarkfilemtch_{curbufnr} != ""
        3792 "   call Decho("exe 2match netrwMarkFile /".s:netrwmarkfilemtch_{curbufnr}."/")
       *3793    exe "2match netrwMarkFile /".s:netrwmarkfilemtch_{curbufnr}."/"
        3794   else
        3795 "   call Decho("2match none")
