I am using Qt Creator to develop and run an application on Linux KDE neon.
My application suddenly refuses to open some URLs, a function that properly worked before. I didn't change anything so I guess some KDE neon updates broke it.

There has been an unresolved discussion on StackOverflow so I suppose it is easier to post the link to that thread (please tell me if that is not ok):

https://stackoverflow.com/q/50883220/1421332

Can someone tell my whether this is a Neon or a Qt Creator issue?