Setting the same distance from the top of the page for chapter and index titles

Question

I noticed that the distance from the top of the page to the chapter title differs from the table of contents and list of <> ones. I can see why, as these elements have specific purposes and semantics in a document:

I have a document in which this distance should be the very same, for project reasons. The following code refers to the previous image:

\documentclass[a4paper,oneside]{book}
\usepackage[useindex]{splitidx}
\newindex[List of Foo]{iof}
\makeindex

\begin{document}
\chapter*{Bar}

Hi there\sindex[iof]{Bar}

\chapter*{Foo}

Hi there\sindex[iof]{Foo}

\printindex*

\end{document}

Chapters could have the same distance of the table of contents / lists of <> or vice versa. I'm stuck with this issue. Any ideas?

Answer 1

You have stumbled upon LaTeX bug 3126 (\twocolumn interfering with \topskip). Load my idxlayout package (which uses multicol) to avoid the bug.

\documentclass[a4paper,oneside]{book}

\usepackage{splitidx}
\makeindex

\usepackage{idxlayout}

\begin{document}

\chapter*{Foo}

Hi there!\index{Foo}

\printindex*

\end{document}