DocBook: fix float tags (was unduly overridden).

The output was not valid for floats without title.

CMakeLists.txt

@@ -6,6 +6,11 @@
 
 cmake_minimum_required(VERSION 3.1.0)
 
+set(CMAKE_CXX_STANDARD 20)
+set(GNUWIN32_DIR D:/LyX/lyx-unstable/lyx-windows-deps-msvc2017)
+set(LYX_USE_QT "QT5")
+set(LYX_REQUIRE_SPELLCHECK true)
+
 set(LYX_PROJECT LyX)
 
 # Instruct cmake to not use gnu extensions,

autotests/export/docbook/basic.xml

@@ -164,7 +164,7 @@ I am a second line of code.
 </tr>
 </tbody>
 </table>
-<table>
+<informaltable>
 <tbody>
 <tr>
 <td align='center' valign='top'>Table that has no caption 1</td>
@@ -182,7 +182,7 @@ I am a second line of code.
 <td align='center' valign='top'>Col 3, row 2</td>
 </tr>
 </tbody>
-</table>
+</informaltable>
 
 <para>Then, one figure: </para>
 <figure>

lib/layouts/stdfloats.inc

@@ -20,7 +20,6 @@ Float
 	UsesFloatPkg          false
 	ListCommand           listoftables
 	RefPrefix             tab
-	DocBookTag            table
 End
 
 
@@ -36,7 +35,6 @@ Float
 	UsesFloatPkg          false
 	ListCommand           listoffigures
 	RefPrefix             fig
-	DocBookTag            figure
 End
 
 
@@ -51,7 +49,6 @@ Float
 	IsPredefined          false
 	UsesFloatPkg          true
 	RefPrefix             alg
-	DocBookTag            figure # TODO: No DocBook tag really corresponds...
 End
 
 

src/Floating.cpp

@@ -40,8 +40,7 @@ Floating::Floating(string const & type, string const & placement,
 	  usesfloatpkg_(usesfloat), ispredefined_(ispredefined),
 	  allowswide_(allowswide), allowssideways_(allowssideways),
 	  html_tag_(htmlTag), html_attrib_(htmlAttrib), html_style_(htmlStyle),
-	  docbook_tag_(docbookTag), docbook_attr_(docbookAttr),
+	  docbook_attr_(docbookAttr), docbook_tag_type_(docbookTagType)
-	  docbook_tag_type_(docbookTagType)
 {}
 
 
@@ -89,22 +88,18 @@ string const & Floating::docbookAttr() const
 }
 
 
-string const & Floating::docbookTag(bool hasTitle) const
+string Floating::docbookTag(bool hasTitle) const
 {
-	if (docbook_tag_.empty()) {
-		docbook_tag_ = "";
 	if (floattype_ == "figure") {
-			docbook_tag_ = hasTitle ? "figure" : "informalfigure";
+		return hasTitle ? "figure" : "informalfigure";
 	} else if (floattype_ == "table") {
-			docbook_tag_ = hasTitle ? "table" : "informaltable";
+		return hasTitle ? "table" : "informaltable";
 	} else if (floattype_ == "algorithm") {
 		// TODO: no good translation for now! Figures are the closest match, as they can contain text.
 		// Solvable as soon as https://github.com/docbook/docbook/issues/157 has a definitive answer.
-			docbook_tag_ = "figure";
+		return "figure";
 	}
 }
-	return docbook_tag_;
-}
 
 
 string const & Floating::docbookTagType() const

src/Floating.h

@@ -81,7 +81,7 @@ public:
 	/// tag type, defaults to "div"
 	std::string const & htmlTag() const;
 	///
-	std::string const & docbookTag(bool hasTitle = false) const;
+	std::string docbookTag(bool hasTitle = false) const;
 	///
 	std::string const & docbookAttr() const;
 	///
@@ -129,8 +129,8 @@ private:
 	mutable std::string defaultcssclass_;
 	///
 	docstring html_style_;
-	/// DocBook tag
+	// There is no way to override the DocBook tag based on the layouts: half of it is determined by whether the float
-	mutable std::string docbook_tag_;
+	// has a title or not, an information that is not available in the layouts.
 	/// attribute (mostly, role)
 	mutable std::string docbook_caption_;
 	/// caption tag (mostly, either caption or title)

src/insets/InsetFloat.cpp

@@ -654,7 +654,7 @@ void docbookNoSubfigures(XMLStream & xs, OutputParams const & runparams, const I
 
 	xs << xml::StartTag(ftype.docbookTag(caption != nullptr), attr);
 	xs << xml::CR();
-	if (caption != nullptr) {
+	if (caption) {
 		xs << xml::StartTag(titleTag);
 		caption->getCaptionAsDocBook(xs, rpNoLabel);
 		xs << xml::EndTag(titleTag);

src/mathed/InsetMathHull.cpp

@@ -2429,7 +2429,7 @@ void InsetMathHull::docbook(XMLStream & xs, OutputParams const & runparams) cons
 	}
 
 	// DocBook also has <equation>, but it comes with a title.
-	// TODO: recognise \tag from amsmath?
+	// TODO: recognise \tag from amsmath? This would allow having <equation> with a proper title.
 
 	docstring attr;
 	for (row_type i = 0; i < nrows(); ++i) {