public SectionAdapter getAdapterForSection(final String tag) {
        final Section section = getValidSectionOrThrowException(tag);

        return getAdapterForSection(section);
    }
Returns the index of the first occurrence of the specified section in this adapter, or -1 if
this adapter does not contain the section. Note that, the visibility of section is being
ignored.

@param section section to search for
@return the index of the first occurrence of the specified section in this adapter, or -1 if
this adapter does not contain the section
library/src/main/java/io/github/luizgrp/sectionedrecyclerviewadapter/SectionedRecyclerViewAdapter.java