Comment # 4 on bug 1171768 from Wolfgang Bauer

(In reply to Luigi Baldoni from comment #3)
> > I suppose this commit in the "release/0.7.0" branch should fix it:
> 
> Not by itself, no.

Yeah, that patch alone doesn't apply to 0.7.0 because there were a lot of other
changes and refactors even in the "release/0.7" branch. I had hoped that's not
the case...

I'm currently trying to backport it, although it doesn't look good. (I'm not
really keen on adding a hundred commits as patches to the package...)

More realistic options would probably be:
- Wait for a new upstream release
- Try to fix the mentioned problem independent of the upstream changes

Regarding 2, the error message seems quite clear to me:
kf5.kio.core: Invalid URL: QUrl("/home/user/sub2.srt")
The URL is invalid because the scheme ("file://") is missing, probably it just
needs an additional QUrl::fromLocalFile() or QUrl::fromUserInput() somewhere.