Well, I lack the knolwdge to join the discussion here, I can just report what happens in my phone: after creating my new open-url.desktop and doing
update-desktop-database $HOME/.local/share/applications/
the browser appeared again in the selection menu. Unfortunately it disappeared after a short time -without rebooting- along with the newly created open-url.desktop file…
I performed every step again and this time around also did
devel-su update-desktop-database /usr/share/applications/
So far so good, it also survived a reboot.
So thank you all for the solution.
My ~/.local/share/applications/
also have files from:
harbour-fernschreiber-open-url.desktop
harbour-webpirate-open-url.desktop
microtube-url.desktop
Two of them are popular apps that are veeery hard to stay away from.
Should we poke individual devs?
Or is there a way for sailors to handle these changes smoothly?