Decrease the space between two type of footnotes

Question

I’m using two types of footnotes in my document, but when I use the two types in the same page, the space between the two blocks is too large (the paper size small, so it is problematic). Is there a way to reduce the space between the two blocks of notes? My minimal example working is

\documentclass[twoside,book]{memoir}
\usepackage{fontspec}
\usepackage{lipsum}
\usepackage[perpage,multiple]{footmisc}
\usepackage[xetex,
    papersize={138mm,215mm},
    total={115mm,180mm}]{geometry}

\paragraphfootnotes 
\renewcommand*{\footnoterule}{}
\footmarkstyle{\textbf{#1--} }
\setlength{\footmarkwidth}{0ex}
\setlength{\footmarksep}{1em}
\renewcommand{\thefootnote}{\Alph{footnote}}

\newfootnoteseries{G}
\plainfootstyle{G}
\footmarkstyleG{\textbf{#1--}}

\begin{document}
\lipsum*[1]{}\footnote{Short footnote}

\lipsum*[2]{}\footnote{Another short footnote}

\lipsum*[4]{}\footnoteG{\lipsum*[3]{}}

\lipsum[5]\lipsum[6]{}
\end{document}

Answer 1

Are you trying to get rid of all space between the two levels of footnotes? LaTeX fights pretty hard to keep some space there. I think this is pretty wise, in fact. In your case, there are two things you could do to get rid of some excess vertical space:

\setlength{\footskip}{0pt} 
\setlength{\footnotesep}{0pt}

Also, given that you defined a footnote series 'G', you could do something like this:

\newskip\supersmallskipamount 
\supersmallskipamount=1pt plus 1pt minus 1pt
\skip\footinsG=\supersmallskipamount% <-- see memoir.cls, starting where 'newfootnoteseries' is defined

Try putting \the\footskip and \the\footnotesep in your first two footnotes then try compiling with the two \setlengths (not) commented out.