Insert this subdirectory into the same dired buffer.
If it is already present, overwrites previous entry,
else appends at end of buffer.
With a prefix arg, you may edit the ls switches used for this listing.
You can add `R' to the switches to expand the whole tree starting at
this subdirectory.
This function takes some pains to conform to ls -lR output." (byte-code "└ ¡ä┬├\"Dç" [dired-get-filename current-prefix-arg read-string "Switches for listing: " dired-actual-switches] 4)])