Thanks to Günter, the ligature-problem is gone. I expanded the lyx2lyx test so, the an error is emitted at 10th repeated run to export lyx16x.
If two consecutive created lyx-files are identical, the test stops without
error.
if a created lyx-file is not loadable, test stops with error.
Now, for example, export/doc/nb/Tutorial_lyx16 adds at each run following
data to the created lyx-file.
> % Added by lyx2lyx
> % for proper underlining
> \PassOptionsToPackage{normalem}{ulem}
> \usepackage{ulem}
> \let\cite@rig\cite
> \newcommand{\b@xcite}[2][\%]{\def\def@pt{\%}\def\pas@pt{#1}
> \mbox{\ifx\def@pt\pas@pt\cite@rig{#2}\else\cite@rig[#1]{#2}\fi}}
> \renewcommand{\underbar}[1]{{\let\cite\b@xcite\uline{#1}}}
Though this creates loadable file, it is no longer compilable.
Pdf-exporting such a file.
! LaTeX Error: Command \b@xcite already defined.
Or name \end... illegal, see p.192 of the manual.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.68 ...s@pt\cite@rig{#2}\else\cite@rig[#1]{#2}\fi}}
Your command was ignored.
Type I <command> <return> to replace it with another command,
or <return> to continue without it.
Kornel
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