Comment 6 for bug 14838

Thanks for the report and comments. There is certainly a bug in spatial mode,
that there is no obvious way to "go back", and the backspace key was a very poor
choice by upstream for that action. But the old behaviour, leaving windows open,
is irritating for the majority of use cases. While there are clearly specific
use cases where you want to leave a folder open and open a subfolder alongside
it, most navigation is with the intent to shift focus to the new directory, not
split focus between the current and the new directory.

For that reason I've asked that we use the new default behaviour on
double-clicking a folder.

You can retain the old behaviour using the pref Seb pointed out, or you can
shift-double-click the folder the leave the parent open while opening the folder.

I'll file a separate bug on a good UI for "going back".