ctests: add test cases for DocBook

Patch from Thibaut Cuvelier.

autotests/export/docbook/stray_emph.lyx

@@ -0,0 +1,148 @@
+#LyX 2.4 created this file. For more info see https://www.lyx.org/
+\lyxformat 619
+\begin_document
+\begin_header
+\save_transient_properties true
+\origin unavailable
+\textclass article
+\begin_preamble
+% DO NOT ALTER THIS PREAMBLE!!!
+%
+%This preamble is designed to ensure that the document prints
+% out as advertised. If you mess with this preamble,
+% parts of the document may not print out as expected.  If you
+% have problems LaTeXing this file, please contact 
+% the documentation team
+% email: lyx-docs@lists.lyx.org
+
+% the pages of the TOC is numbered roman
+% and a pdf-bookmark for the TOC is added
+\pagenumbering{roman}
+\let\myTOC\tableofcontents
+\renewcommand\tableofcontents{%
+  \pdfbookmark[1]{\contentsname}{}
+  \myTOC
+  \cleardoublepage
+  \pagenumbering{arabic} }
+\end_preamble
+\use_default_options false
+\maintain_unincluded_children no
+\language catalan
+\language_package default
+\inputencoding utf8
+\fontencoding auto
+\font_roman "palatino" "default"
+\font_sans "helvet" "default"
+\font_typewriter "courier" "default"
+\font_math "auto" "auto"
+\font_default_family default
+\use_non_tex_fonts false
+\font_sc false
+\font_roman_osf false
+\font_sans_osf false
+\font_typewriter_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 12
+\spacing single
+\use_hyperref true
+\pdf_title "Introducció al LyX"
+\pdf_author "LyX Team, translation: Joan Montané, Daniel Fernández"
+\pdf_subject "LyX-documentation Introducció"
+\pdf_keywords "LyX, Documentation"
+\pdf_bookmarks true
+\pdf_bookmarksnumbered true
+\pdf_bookmarksopen true
+\pdf_bookmarksopenlevel 2
+\pdf_breaklinks false
+\pdf_pdfborder false
+\pdf_colorlinks true
+\pdf_backref false
+\pdf_pdfusetitle false
+\pdf_quoted_options "linkcolor=black, citecolor=black, urlcolor=blue, filecolor=blue, pdfpagelayout=OneColumn, pdfnewwindow=true, pdfstartview=XYZ, plainpages=false"
+\papersize a4
+\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_formatted_ref 0
+\use_minted 0
+\use_lineno 0
+\index Índex
+\shortcut idx
+\color #008000
+\end_index
+\secnumdepth 3
+\tocdepth 2
+\paragraph_separation indent
+\paragraph_indentation default
+\is_math_indent 0
+\math_numbering_side default
+\quotes_style french
+\dynamic_quotes 0
+\papercolumns 1
+\papersides 1
+\paperpagestyle default
+\tablestyle default
+\tracking_changes false
+\output_changes false
+\change_bars false
+\postpone_fragile_content false
+\html_math_output 0
+\html_css_as_file 0
+\html_be_strict false
+\docbook_table_output 0
+\docbook_mathml_prefix 1
+\end_header
+
+\begin_body
+
+\begin_layout Title
+Introducció al \SpecialChar LyX
+
+\end_layout
+
+\begin_layout Standard
+El LaTeX és un sistemaf
+\begin_inset Foot
+status open
+
+\begin_layout Plain Layout
+la bibliografia.
+
+\emph on
+ 
+\end_layout
+
+\end_inset
+
+.
+\end_layout
+
+\end_body
+\end_document

autotests/export/docbook/stray_emph.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- This DocBook file was created by LyX 2.4.0~RC1.devel
+  See https://www.lyx.org/ for more information -->
+<article xml:lang="ca-ES" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:m="http://www.w3.org/1998/Math/MathML" xmlns:xi="http://www.w3.org/2001/XInclude" version="5.2">
+<title>Introducció al LyX</title>
+<para>El LaTeX és un sistemaf<footnote>
+<para>la bibliografia.<emphasis></emphasis> </para>
+</footnote>.</para>
+</article>