ctests: edit test sample for bug #10371

autotests/export/LongestLabelWithUnderscore.lyx

@@ -1,5 +1,5 @@
-#LyX 2.2 created this file. For more info see http://www.lyx.org/
-\lyxformat 504
+#LyX 2.3 created this file. For more info see http://www.lyx.org/
+\lyxformat 512
 \begin_document
 \begin_header
 \save_transient_properties true
@@ -24,6 +24,7 @@
 \font_osf false
 \font_sf_scale 100 100
 \font_tt_scale 100 100
+\use_microtype false
 \graphics default
 \default_output_format pdf5
 \output_sync 0
@@ -93,20 +94,21 @@ longest label
 \end_layout
 
 \begin_layout Standard
-Setting the longest label to a string containing underscore (or another
- special character like 
+This means that setting the longest label to a string containing an underscore
+ (or another special character like 
 \family typewriter
 
 \backslash
 ]$%#^
 \family default
-...) may lead to an uncompilable document (while in valid constructs like 
+...) leads to an uncompilable document (except for valid LaTeX constructs like
+ 
 \family typewriter
 $
 \backslash
 sin^2 x_i$
 \family default
- they are OK).
+).
  
 \end_layout