If you see here, the author mentions an "official version" of an indentation script from Johannes Zellner. The link is broken and while there are traces of Zellner all over the interwebs, I can't find the script.
Maybe there is a more up to date, somehow "official" (e.g. endorsed by TUG or some community, such as this one!) script for TeX indentation in Vim? (Or more particularly, in Vim+Latex-Suite, not that that really should make a difference?)
If not, I'll probably customize Tanzler's script, in which case, my question becomes "what are the best practices for TeX source indentation"?
I'm inclined to do
First sentence of new paragraph
continuation of first sentence.
Second sentence of paragraph
continuation of second sentence.
Third sentence of paragraph
continuation.
\begin{environment}
\item First item
continuation of first item
\item Second item
\end{environment}
etc., but if there are established best practices for TeX source indentation, I will follow them instead.
EDIT: Screenshots illustrating @J.C.Salomon 's explanation.
My original way:
Suggested better way:
\item
lines within it are fairly standard.diff
on the two versions. Then try the experiment without that indentation. Compare the diffs: which has less uninteresting information?