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Proper vertical spacing and pagebreaks in custom environment

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I would like to design a simple environment which displays examples.This is what I got so far:

\documentclass{article}\usepackage{xcolor}\usepackage{parskip}\usepackage{lipsum}\makeatletter  \newcommand\filltoend{\leavevmode\leaders\hrule height 0.7ex depth \dimexpr0.4pt-0.7ex\hfill\kern0pt}  \newcounter{example}  \newenvironment{example}[1][]{%    \refstepcounter{example}%    \textbf{Example~\theexample{}}~{\color{gray}\filltoend}% number and line    \nopagebreak% is this the right place?    \par% should I call other vertical spacing commands so I can use the plus/minus syntax?    \textbf{#1}% Heading    \par\itshape\ignorespaces%  }{%     \\% it would be nice to keep this together with contents     {\color{gray}\null\filltoend\null}  }\makeatother\begin{document}\lipsum[1-4]\begin{example}[My example]    \lipsum[5]\end{example}\end{document}

This is simple and kind of ok.

How can I specify that I want some non-strechable vertical space between the example's number and line, heading and text?How do I discourage LaTeX from putting page breaks between the header components?

In other words: I would like to keep the Example # ---, heading, and start of inner paragraph together, on the same page and without too large spacing between them.


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