Testcase for underscore in longest label in lists.

autotests/export/LongestLabelWithUnderscore.lyx

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+#LyX 2.2 created this file. For more info see http://www.lyx.org/
+\lyxformat 504
+\begin_document
+\begin_header
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+\use_package mhchem 0
+\use_package stackrel 0
+\use_package stmaryrd 0
+\use_package undertilde 0
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+\end_header
+
+\begin_body
+
+\begin_layout Standard
+Setting the longest label to a string containing underscore leads to uncompilabl
+e document.
+ See Paragraph Settings...Longest label
+\end_layout
+
+\begin_layout Labeling
+\labelwidthstring Longest_Label_With_Underscore
+\noindent
+Longest_Label_With_Underscore Long label with underscore
+\end_layout
+
+\end_body
+\end_document