5+%if 0%{?is_opensuse}
 6+%bcond_without fish_support
 7+%else
 8+%bcond_with fish_support
 9+%endif

This is opening the leap gap again. Leap is supposedly inheriting binaries from SLE with 15.3;

Hello, that's correct you really want to use is_opensuse only for differentiation in between (SLE and Leap) or openSUSE Factory. Since Leap 15.3 will simply reuse SLE-binaries, but we need to make sure that re-building sources on Leap would produce the same feature-set.

Based on https://en.opensuse.org/openSUSE:Build_Service_cross_distribution_howto it should be %if 0%{?suse_version} > 1500 # Please mind that ever changing comment on the page.

Ok, will fix it. Thanks for the suggestion.