[Users] Clicking a link in claws-mail opens it in default browser after a very long wait

[Removed GDPR]

I think I may have found a fix for the issue, so I will share it in
case someone else experiences anything similar.

I noticed that the first time xdg-open tries to open a URL a
notification in the tray area appears. So I went to "Proxy - System
Settings Module" in Plasma and I saw it was set to "Detect proxy
configuration automatically" which I changed to "No Proxy". Now
clicking links seems to work fine.
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