Lack of inter-chapter break in List of Figures

Question

I'm using tufte-book and include (nine) individual chapters and an Appendix, which I typeset as a (starred) \chapter*{Appendix} (because I don't want it numbered as a chapter).

The below is not a MWE, but gives the core structure of my document:

\documentclass[twoside,symmetric]{tufte-book}
\begin{document}
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\include{PaPCh1}  
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\include{PaPCh9} 
\include{PaPApp}
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\listoffigures
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where the Appendix source, PaPApp.tex, starts:

\chapter*{Appendix} \addcontentsline{toc}{chapter}{Appendix} 

\renewcommand{\thesection}{\Alph{section}}

\renewcommand{\thesubsection}{\thesection.\arabic{subsection}}

\renewcommand{\thefigure}{A\arabic{figure}}

The bulk of the typeset document is fine, with Figures properly numbered 1.1, 1.2, in Chapter 1; 2.1, 2.2, in Chapter 2; etc., and A.1, A.2 etc., in the Appendix.

In the typesetting of \listoffigures there is (properly) a space between the list of figures in each individual chapter, i.e., between Chapter 1 and Chapter 2. The problem is that the List of Figures fails to insert a space between the figures in last ("unstarred") chapter and the figures in the Appendix:

How can I ensure there is a space between the list of figures in the last chapter and the list of figures in the Appendix in the listoffigures?

Answer 1

At the beginning of the appendix, insert this line:

\addtocontents{lof}{\vspace{\baselineskip}}

(or other dimension as desired).

Modifications such as added space between entries, page breaks, changes to page length (\enlargethispage), can be inserted with the \addtocontents command. The first argument specifies which list: toc, lof, lot. The second argument gives the command(s) to be inserted.

If the insertion is to be applied before a chapter, and chapters are \included, the \addtocontents must be placed in the file with the \chapter command, since \include will defer such a command until the included file has been fully processed, with the result that the added material will appear later than intended.

Order is always important. In the present case, \addtocontents can be inserted any time before the first figure in the appendix, but it's best to put it near the beginning of the appendix (chapter) so it can be found easily if a change is needed later.