vscode_mess_open_folder

firefox_about_config

layout.css.devPixelsPerPx

note.txt

Just wanted to follow up on this issue because I get the same behavior.
It also happens when using xdg-open to open a directory (e.g. xdg-open ~).

I also set nautilus as the default for inode/directory

➜ xdg-mime default nautilus.desktop inode/directory

➜ xdg-mime query default inode/directory           
nautilus.desktop

but it still doesn't work.

Then I looked for the distribution-provided defaults for inode/directory

➜ cat /usr/share/applications/mimeinfo.cache | grep inode/directory
inode/directory=visual-studio-code.desktop;org.gnome.Nautilus.desktop;

and it seems the order here does matter, changing it to

inode/directory=org.gnome.Nautilus.desktop;visual-studio-code.desktop;

fixes the issue.

Sadly I'm not an expert in this field so I can't tell you if you can influence this or if this needs to be done after every update (I hope not because vs code is still registered).

It might be even a issue with gio (used here) and opening directories.
Because it works for text/plain as expected (it opens the file in gedit)

➜ xdg-mime query default text/plain                
gedit.desktop
 
➜ cat /usr/share/applications/mimeinfo.cache | grep text/plain     
text/plain=visual-studio-code.desktop;org.gnome.gedit.desktop;

➜ xdg-open ~/some.txt