In various applications when I do "show file in folder" it simply open the file-manager (nemo) but does not select the actual file. How can I make show in folder also select the file?
You would have to change each of the applications not to 'just' open with
nemo with the directory as an argument but with the file.
Nemo already supports this, and you can easily test from a terminal with:
touch /var/tmp/xxx.txt nemo /var/tmp/xxx.txt
this opens a view on
xxx.txt selected (tested with
nemo version 2.0.8)