Remember selected items when changing directory

[Dreamer]

Remember selected items when changing directory option - to be able to select the files from more than one directory. Then also some indicator that files in other dirs are selected is needed, perhaps in the title bar, or/and status bar...

E.g. (long and short versions):

(12 items selected)
(12 items selected, in 3 directories)
(*12)
(*12/3)