Comment # 56 on bug 1106850 from Stefan Dirsch

Giacomo, I'm feeling with you! The thing is, that Leap 15 inherits the sources
of sle 15. Therefore I need to submit for sle 15, so I won't lose fixes for our
enterprise product. But it takes a rather long time until things get checked in
into sle15 and then QA starts testing this and releases updates for it. 

And AFAIU no Leap updates are available before. And this really can take
months. :-( I even tried submitting the fix for leap 15 in parallel. It was
declined, since then it could no longer inherit the sources of sle 15. Sigh.
:-(