Farsi document with custom font encoding OT1 fails.

Set font encoding in examples to "auto" and add minimal test sample.

autotests/export/latex/fa-OT1.lyx

@@ -0,0 +1,129 @@
+#LyX 2.4 created this file. For more info see https://www.lyx.org/
+\lyxformat 566
+\begin_document
+\begin_header
+\save_transient_properties true
+\origin unavailable
+\textclass article
+\use_default_options false
+\maintain_unincluded_children false
+\language farsi
+\language_package default
+\inputencoding utf8
+\fontencoding OT1
+\font_roman "default" "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
+\use_microtype false
+\use_dash_ligatures false
+\graphics default
+\default_output_format pdf2
+\output_sync 0
+\bibtex_command default
+\index_command default
+\float_placement class
+\float_alignment class
+\paperfontsize default
+\spacing onehalf
+\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 0
+\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 swiss
+\dynamic_quotes 0
+\papercolumns 1
+\papersides 1
+\paperpagestyle 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
+\SpecialChar LyX
+ مستنداتی عالی دارد—لطفا از آن استفاده کنید! از قسمت 
+\family sans
+\lang english
+Help
+\lang farsi
+\SpecialChar menuseparator
+
+\lang english
+Introduction
+\family default
+\lang farsi
+ شروع کنید، که مستندات را به صورت خلاصه به شما معرفی می‌کند.
+\end_layout
+
+\begin_layout Standard
+\paragraph_spacing single
+
+\lang english
+The farsi font-encoding 
+\begin_inset Quotes cld
+\end_inset
+
+LAE
+\begin_inset Quotes crd
+\end_inset
+
+ should be added to the fontenc arguments also with a custom font-encoding
+ (similar to LGR for Greek and T2A for Russian).
+\end_layout
+
+\begin_layout Standard
+
+\lang english
+(This document sets the fontencoding to 
+\begin_inset Quotes cld
+\end_inset
+
+custom [OT1]
+\begin_inset Quotes crd
+\end_inset
+
+ to avoid bitmap fonts with CM.)
+\end_layout
+
+\end_body
+\end_document

development/autotests/invertedTests

@@ -56,9 +56,11 @@ export/export/latex/iconv-error-nomenclature_pdf2
 #    TextClass.cpp (1385): The layout does not provide a list command for
 #      the float `sidebar'. LyX will not be able to produce a float list.
 #
+# which makes "check_load" and "lyx2lyx" fail (lyx2lyx for < 2.3 is ignored).
 check_load/templates/acmart
 export/templates/acmart_lyx23
 
+
 # Failing LyX2LyX conversions for old versions: 
 #
 # "beamer" lyx2lyx fails sometimes for versions < 2.1
@@ -73,6 +75,9 @@ export/examples/beamerlyxexample1_lyx(16|20)
 # * reversed order of command arguments results in incompilable LaTeX 
 export/examples/(|es/)modernCV_lyx(16|20)
 
+# Farsi font encoding LAE should be added also to custom font encoding
+# (similar to the Greek font encoding LGR).
+export/export/latex/fa-OT1_pdf2
 
 # input encoding tests
 # --------------------

lib/examples/fa/splash.lyx

@@ -10,7 +10,7 @@
 \language farsi
 \language_package default
 \inputencoding utf8
-\fontencoding OT1
+\fontencoding auto
 \font_roman "default" "default"
 \font_sans "default" "default"
 \font_typewriter "default" "default"