Enumerated sublists with explicit start render wrong in LaTeX

[bgeron]

Problem

The following renders wrong in LaTeX:

1.  First item

    5.  Fifth subitem
    6.  Sixth subitem

2.  Second item

Expected / HTML rendering: visually similar to source code

Wrong / current LaTeX PDF rendering:

1.  First item
    (a) Fifth subitem
    (b) Sixth subitem
5.  Second item

The problem is that "Second item" was never labelled "5" in the RST source.

The generated LaTeX source for this is as follows:

\begin{enumerate}
\item {} 
First item
\begin{enumerate}
\setcounter{enumi}{4}
\item {} 
Fifth subitem

\item {} 
Sixth subitem

\end{enumerate}

\item {} 
Second item

\end{enumerate}

Expected LaTeX output: ... \setcounter{enumii}{4} (rather than enumi).

Environment info

• OS: Ubuntu 17.10
• Python version: 3.6.3
• Sphinx version: 1.6.5

[bgeron]

Mildly related: #1431

[tk0miya]

Fixed by #4639.
Thank you for reporting!

[bgeron]

Thanks for fixing!