`\Highlight` in minipage extend over the width of the minipage

[quark67]

MWE:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{tikzmark}
\usetikzmarklibrary{highlighting}

\begin{document}
\noindent\begin{minipage}{5cm}
The sun was shining on the sea, shining with all its might.
\StartHighlighting[fill=cyan!50]
And this was very odd because it was the middle of the night.
\StopHighlighting
The moon was up there sulkily because she thought the sun had no
business to be there after the day was done.
\StartHighlighting[fill=magenta!50,/tikz/highlighter/left margin=0pt,
/tikz/highlighter/right margin=0pt,
/tikz/highlighter/initial offset=0pt,
/tikz/highlighter/final offset=0pt,
]
‘‘It’s very rude of him,’’ she said, ‘‘to come and spoil the fun.’’
\StopHighlighting
\noindent The sun was shining on the sea, shining with all its
might.
And this was very odd because it was the middle of the night.
\StartHighlighting[fill=yellow!50]
The moon was up there sulkily because she thought the sun had no
business to be there after the day was done\StopHighlighting.
‘‘It’s very rude of him,’’ she said, ‘‘to come and spoil the fun.’’
\end{minipage}
\end{document}

As we see with magenta,

/tikz/highlighter/left margin=0pt,
/tikz/highlighter/right margin=0pt,
/tikz/highlighter/initial offset=0pt,
/tikz/highlighter/final offset=0pt,

is not enough.

By the way, if instead the four lines above, I use/tikz/highlighter/margin=0pt, this gives this error:

Package pgfkeys Error: I do not know the key '/tikz/left margin', to which you passed '0pt', and I am going to ignore it. Perhaps you misspelled it.

Yes, /tikz/highlighter/margin gives an error related to /tikz/left margin, despite the manual speak about the margin key:

[loopspace]

Nice spot. I guess the highlighter also needs to save the current line length at the time of invocation. It's probably a little complicated as it will need to know the start and end of the current line. Moreover, these might be different at the start and end of the highlighting. Hmm.

As for the keys, it's because margin expands to each of left margin etc, but the expansion simply inserts the new keys into the key parser in its current key path. So if you invoke /tikz/higlighter/margin=0pt then that becomes left margin=0pt, ... without being in the /tikz/highlighter/ path. I've added in the absolute paths in the latest commit as that seems to me to be the only way to fix that.