ctests: sample for Arabic as secondary language.

autotests/export/latex/en-ar_language-default.lyx

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+#LyX 2.4 created this file. For more info see https://www.lyx.org/
+\lyxformat 569
+\begin_document
+\begin_header
+\save_transient_properties true
+\origin unavailable
+\textclass article
+\use_default_options true
+\maintain_unincluded_children false
+\language english
+\language_package default
+\inputencoding auto
+\fontencoding auto
+\font_roman "lmodern" "default"
+\font_sans "default" "default"
+\font_typewriter "default" "default"
+\font_math "auto" "auto"
+\font_default_family default
+\use_non_tex_fonts false
+\font_sc false
+\font_osf false
+\font_sf_scale 100 100
+\font_tt_scale 100 100
+\font_cjk gbsn
+\use_microtype false
+\use_dash_ligatures true
+\graphics default
+\default_output_format pdf2
+\output_sync 0
+\bibtex_command default
+\index_command default
+\float_placement class
+\float_alignment class
+\paperfontsize default
+\spacing single
+\use_hyperref false
+\papersize default
+\use_geometry false
+\use_package amsmath 1
+\use_package amssymb 1
+\use_package cancel 1
+\use_package esint 1
+\use_package mathdots 1
+\use_package mathtools 1
+\use_package mhchem 1
+\use_package stackrel 1
+\use_package stmaryrd 1
+\use_package undertilde 1
+\cite_engine basic
+\cite_engine_type default
+\biblio_style plain
+\use_bibtopic false
+\use_indices false
+\paperorientation portrait
+\suppress_date false
+\justification true
+\use_refstyle 1
+\use_minted 0
+\index Index
+\shortcut idx
+\color #008000
+\end_index
+\secnumdepth 3
+\tocdepth 3
+\paragraph_separation indent
+\paragraph_indentation default
+\is_math_indent 0
+\math_numbering_side default
+\quotes_style english
+\dynamic_quotes 0
+\papercolumns 1
+\papersides 1
+\paperpagestyle default
+\tablestyle default
+\tracking_changes false
+\output_changes false
+\html_math_output 0
+\html_css_as_file 0
+\html_be_strict false
+\end_header
+
+\begin_body
+
+\begin_layout Standard
+Multi-lingual document, with parts in European languages and parts in Arab
+ or Farsi require the input encodings 
+\begin_inset Quotes eld
+\end_inset
+
+utf8
+\begin_inset Quotes erd
+\end_inset
+
+ or 
+\begin_inset Quotes eld
+\end_inset
+
+auto
+\begin_inset Quotes erd
+\end_inset
+
+, because LyX's 
+\begin_inset Quotes eld
+\end_inset
+
+unicodesymbols
+\begin_inset Quotes erd
+\end_inset
+
+ definitions miss characters from the Arabic script.
+\end_layout
+
+\begin_layout Enumerate
+The main language of this document is English.
+\end_layout
+
+\begin_layout Enumerate
+For Greek and Cyrillic, short texts may be written without setting the language
+ (hyphenation will be missing and spell-checking complain): Greetings; Grüße;
+ Приветы; χαιρετισμός.
+ 
+\end_layout
+
+\begin_deeper
+\begin_layout Standard
+However, this does not work for Arabic (and CJK) characters.
+\end_layout
+
+\end_deeper
+\begin_layout Enumerate
+For longer text parts, it is recommended to set the correct language, for
+ Arabic and Farsi this is required:
+\end_layout
+
+\begin_deeper
+\begin_layout Description
+Arabic: 
+\lang arabic_arabi
+مجموعة اللغات السامية،
+\end_layout
+
+\end_deeper
+\end_body
+\end_document