Select the second item in the file finder by default (#6947)

This PR completes the first task of the Tabless editing feature (#6424).
It makes file finder select the previously opened file by default which
allows the user to quickly switch between two last opened files by
clicking `Cmd-P + Enter`.

This feature was also requested in #4663 comments.

Release Notes:
* Improved file finder selection: currently opened item is not selected now