A bug has been introduced in Nautilus 4 years ago, where opening a multi-selection of files with an app launches N instances of the app, instead of opening the N files in a single instance (previous/desired behaviour).
It was finally fixed 2 months ago: https://gitlab.gnome.org/GNOME/nautilus/-/commit/080f83385ff79a8be54ee31e7a45422138226f1f, a bit before version 40rc.
How do I install the more recent nautilus (say 40.1) on Ubuntu 20.04? I currently have nautilus 3.36.3
I've googled around, and people mention adding the gnome3 ppa, but it doesn't have any binaries for focal.
Is my only resort to build it from source?