Long chapter and section title cause problem with line numbering

[mxordn]

Version of reledmac / reledpar (if that is a devellopement version, please precise the branch)

v2.26.12

Does the problem happens both in parallel typesetting and normal typesetting?

Only tested with paralell pages typesetting.

Description of the problem

A chapter oder section title which flows over more than one line causes strange behavior of the linenumbering printed on the left or right side. Although the apparatus numbering seems to be correct. One can find a first discussion of the problem here: https://tex.stackexchange.com/questions/446339/long-section-titles-with-reledpar

The comments Florian an Ulrike made there, were already helpful to unterstand the principle an having a workaround.

Minimal Working Example

\documentclass[11pt, pagesize=false]{scrbook}
\usepackage{fontspec}
\usepackage{blindtext}

\usepackage[papersize={17cm, 24cm}, left=2.4cm, right=1.8cm, top=3.5cm, bottom=2.4cm,dvips=false,pdftex=false,vtex=false]{geometry}

\usepackage{polyglossia}
    \setdefaultlanguage[spelling=new]{german}
    \setotherlanguage[variant=classic]{latin}

\setmainfont[Numbers=OldStyle]{TeX Gyre Pagella}

\usepackage{scrlayer-scrpage}

\usepackage[series={A}]{reledmac}
\usepackage{reledpar}
\Xarrangement[A]{paragraph}

\eledsectnotoc{R}
\eledsectmark{L}

\begin{document}

\begin{pages}
\begin{Leftside}
\selectlanguage{latin}
\beginnumbering
\pstart
\eledsection*{Long Title that goes faaaaar beyond one line with a lot of text going on and on}
\pend\pstart
\blindtext[1]
\pend\pstart
A paragraph
\pend\pstart
\blindtext[1]
\pend
\endnumbering
\end{Leftside}

\begin{Rightside}
\selectlanguage{ngerman}
\beginnumberingR
\pstart
\eledsection*{Ein langer Titel ohne Punkt und Komma und außerdem ganz viel Text}
\pend\pstart
\blindtext[1]
\pend\pstart
A \edtext{footnote}{\Afootnote{A remark.}}
\pend\pstart
\blindtext[1]
\pend
\endnumberingR
\end{Rightside}
\end{pages}
\Pages
\end{document}

[adunning]

I can confirm that this is a bug in reledmac core rather than reledpar; here is a more minimal example:

\documentclass{article}
\usepackage[series={},nocritical,noend,nofamiliar,noledgroup]{reledmac}
\linenummargin{inner}
\usepackage{blindtext}

\begin{document}

\beginnumbering
\pstart
\eledsection*{\blindtext}
\pend

\pstart
\blindtext
\pend

\endnumbering

\end{document}

The really odd thing is that a two-line heading is counted as only one line, but in the attached it seems to start counting again after seven lines.

[adunning]

Actually, this is a duplicate of #197.

[maieul]

yeah, and the problem is already explained on #197. I need time to solve it.