[Desktop] Provide option to "always" open files with system default or provide "do not ask again" option

Description

As it is now, users can disable Webtorrent in settings and after doing this, the browser will prompt the user after clicking/downloading on a magnet link or torrent file, asking whether or not you’d like to use [System default torrent client] to open the file.

However, with this method, users are prompted every time they attempt to download a torrent/magnet file. This can be cumbersome and there should be a way to tell the browser to always default to the users preferred torrent client.

Consideration and Suggestion When adding this feature, there should also be a way to reverse the decision so that users can choose different clients if necessary.

I would suggest adding a couple checkboxes to the UI for the simplest implementation (plz excuse the hasty shop job):

And in Settings --> Extensions:

cc @yrliou @rebron

[bencefalo]

It would be great if when this is fixed its fixed for other apps and not just torrent… like zoom.us and webex. You are prompted every time to open zoom when browser from a zoom meeting

[belminf]

Linux one-liner that worked for me:

sudo mkdir -p /etc/chromium/policies/managed && echo '{"ExternalProtocolDialogShowAlwaysOpenCheckbox": true}' | sudo tee /etc/chromium/policies/managed/protocol_open.json

No need to restart. Just needed to select the checkbox the first time opening a protocol. For e.g., for magnet links: