This languagenesting1.lyx fails with 2.1

Add some stuff to languagenesting1.lyx that makes it fail with LyX 2.1 (and
2.2 as well)

autotests/export/languagenesting1.lyx

@@ -1,8 +1,7 @@
-#LyX 2.2 created this file. For more info see http://www.lyx.org/
-\lyxformat 503
+#LyX 2.1 created this file. For more info see http://www.lyx.org/
+\lyxformat 474
 \begin_document
 \begin_header
-\origin unavailable
 \textclass scrbook
 \options fleqn,bibliography=totoc,index=totoc,BCOR7.5mm,titlepage,captions=tableheading
 \use_default_options false
@@ -33,16 +32,16 @@ End
 \language_package default
 \inputencoding auto
 \fontencoding global
-\font_roman "default" "FreeSans"
-\font_sans "default" "FreeSans"
-\font_typewriter "default" "FreeSans"
-\font_math "auto" "auto"
+\font_roman FreeSans
+\font_sans FreeSans
+\font_typewriter FreeSans
+\font_math auto
 \font_default_family default
 \use_non_tex_fonts true
 \font_sc false
 \font_osf false
-\font_sf_scale 100 100
-\font_tt_scale 100 100
+\font_sf_scale 100
+\font_tt_scale 100
 \graphics default
 \default_output_format default
 \output_sync 0
@@ -104,8 +103,7 @@ End
 \begin_body
 
 \begin_layout Title
-Erweiterte \SpecialChar LyX
- Features
+Erweiterte LyX Features
 \end_layout
 
 \begin_layout Subtitle
@@ -126,14 +124,75 @@ NoWeb
 \family default
 ->
 \family sans
-Program 
+Program
 \family default
-with Flags set to
+ with Flags set to
 \end_layout
 
 \begin_layout Standard
 geschrieben.
 \end_layout
 
+\begin_layout Standard
+\begin_inset Flex Multiple Columns
+status open
+
+\begin_layout Plain Layout
+
+\size footnotesize
+\lang english
+\begin_inset Argument 1
+status open
+
+\begin_layout Plain Layout
+
+\lang english
+3
+\end_layout
+
+\end_inset
+
+It can be imagined that my close intimacy.
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+Spalten innerhalb einer Spalte sind ebenfalls möglich:
+\end_layout
+
+\begin_layout Standard
+\begin_inset Flex Multiple Columns
+status open
+
+\begin_layout Plain Layout
+
+\size footnotesize
+\lang english
+The Honourable Ronald Adair.
+\end_layout
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+Fortgeschrittene Beispiele
+\end_layout
+
+\begin_layout Nut
+
+\lang latin
+Lorem ipsum dolor sit.
+\end_layout
+
+\begin_layout Standard
+dann nur
+\end_layout
+
 \end_body
 \end_document

development/autotests/suspiciousTests

@@ -208,9 +208,7 @@ export/mathmacros/testcases_master_child_.*
 export/mathmacros/testcases_speed_(dvi|pdf|pdf[23]|(dvi3|pdf[45])_(texF|systemF))
 
 # Language nesting, document is OK, fails because of a bug in LyX
-# Does no longer fail
-# export/export/languagenesting1_(dvi|pdf(|[23]))
-#
+export/export/languagenesting1_(pdf4_systemF|pdf5_systemF)
 
 # But this one fails fails because of a bug in LyX
 # Probably language mess