\exi \gll in langsci-gb4e breaks justification

[kopeckyf]

When a row of examples contains an \exi that also contains a \gll, the justification is messed up. This error is not in gb4e and seems to have been introduced (without intention/knowledge) in langsci-gb4e.

MWE:

\documentclass{article}

\usepackage{langsci-gb4e}
\usepackage{lipsum}

\begin{document}
\begin{exe}
	\ex \lipsum[1]
	\exi{}
	\gll Lorem Ipsum Dolor\\
	     Lorem Ipsum Dolor\\	
	\ex \lipsum[2]
\end{exe}
\end{document}

Output:

[kopeckyf]

Note that this issue does not arise if the \exi does not contain a gll:

\documentclass{article}

\usepackage{langsci-gb4e}
\usepackage{lipsum}

\begin{document}
\begin{exe}
	\ex \lipsum[1]
	\exi{} Hello World
	\ex \lipsum[2]
\end{exe}
\end{document}

[kopeckyf]

Issue appears to be unrelated to \exi. Likely culprit is improper grouping in the definition of \gll:

\def\gll%                  % Introduces 2-line text-and-gloss.
   {\raggedright%
     \bgroup %\begin{flushleft}
     \ifx\@gsingle1%
	 \def\baselinestretch{1}\@selfnt\fi
    \bgroup
    \twosent
}

The \raggedright here is not grouped and should be placed after \bgroup. But it's not clear why \raggedright is needed here as it is not in use in \glll. Testing will reveal whether \raggedright should be deleted here.

[kopeckyf]

It seems that the intention of \raggedright was to solve some overflowing issues, so these overflowing issues need to be kept in mind when \raggedright is removed/grouped/replaced with a better solution/...

Original commit: 046dca9 by @Glottotopia (?)