Support the mathbbm font.

Should just be able to read formulae, not add it from the GUI, as it's mostly redundant with mathds and mathbb.

lib/symbols

@@ -119,6 +119,7 @@ mathnormal        font        mathmode  inherit  medium   up  math
 frak              font        mathmode
 mathbb            font        mathmode
 mathds            font        mathmode
+mathbbm           font        mathmode
 mathbf            font        mathmode
 mathcal           font        mathmode
 mathfrak          font        mathmode

src/FontEnums.h

@@ -47,6 +47,8 @@ enum FontFamily {
 	///
 	DS_FAMILY,
 	///
+	BBM_FAMILY,
+	///
 	EUFRAK_FAMILY,
 	///
 	RSFS_FAMILY,

src/FontInfo.cpp

@@ -494,6 +494,7 @@ string getFamilyCSS(FontFamily const & f)
 	case MSA_FAMILY:
 	case MSB_FAMILY:
 	case DS_FAMILY:
+	case BBM_FAMILY:
 	case EUFRAK_FAMILY:
 	case RSFS_FAMILY:
 	case STMARY_FAMILY:

src/LaTeXFeatures.cpp

@@ -1159,7 +1159,8 @@ char const * simplefeatures[] = {
 	"pict2e",
 	"drs",
 	"environ",
-	"dsfont"
+	"dsfont",
+	"bbm"
 };
 
 char const * bibliofeatures[] = {

src/frontends/qt/GuiFontLoader.cpp

@@ -36,8 +36,8 @@ using namespace std;
 using namespace lyx::support;
 
 QString const math_fonts[] = {"cmex10", "cmmi10", "cmr10", "cmsy10",
-	"dsrom10", "esint10", "eufm10", "msam10", "msbm10", "rsfs10",
+	"dsrom10", "bbm10", "esint10", "eufm10", "msam10", "msbm10",
-	"stmary10", "wasy10"};
+	"rsfs10", "stmary10", "wasy10"};
 int const num_math_fonts = sizeof(math_fonts) / sizeof(*math_fonts);
 
 namespace lyx {

src/mathed/InsetMathFont.cpp

@@ -136,6 +136,8 @@ void InsetMathFont::validate(LaTeXFeatures & features) const
 			features.require("mhchem");
 		if (fontname == "mathds")
 			features.require("dsfont");
+		if (fontname == "mathbbm")
+			features.require("bbm");
 	} else if (features.runparams().math_flavor == OutputParams::MathAsHTML) {
 		features.addCSSSnippet(
 			"span.normal{font: normal normal normal inherit serif;}\n"

src/mathed/MathSupport.cpp

@@ -785,6 +785,8 @@ fontinfo fontinfos[] = {
 			  inh_shape, Color_math},
 	{"mathds",        DS_FAMILY, inh_series,
 			  inh_shape, Color_math},
+	{"mathbbm",       BBM_FAMILY, inh_series,
+			  inh_shape, Color_math},
 	{"mathtt",        TYPEWRITER_FAMILY, inh_series,
 			  inh_shape, Color_math},
 	{"mathit",        inh_family, inh_series,

src/output_docbook.cpp

@@ -39,6 +39,7 @@
 #include <stack>
 #include <iostream>
 #include <algorithm>
+#include <sstream>
 
 using namespace std;
 using namespace lyx::support;
@@ -862,18 +863,26 @@ void outputDocBookInfo(
 	generateDocBookParagraphWithoutSectioning(text, buf, xs, runparams, paragraphs, bpitInfo, epitInfo);
 
 	if (hasAbstract) {
+		// Sometimes, there are many paragraphs that should go into the abstract, but none generates actual content.
+		// Thus, first generate to a temporary stream, then only create the <abstract> tag if these paragraphs
+		// generate some content.
+		odocstringstream os2;
+		XMLStream xs2(os2);
+		generateDocBookParagraphWithoutSectioning(text, buf, xs2, runparams, paragraphs, bpitAbstract, epitAbstract);
+
+		// Actually output the abstract if there is something to do.
+		if (!os2.str().empty()) {
 			string tag = paragraphs[bpitAbstract].layout().docbookforceabstracttag();
 			if (tag == "NONE")
 				tag = "abstract";
 
 			xs << xml::StartTag(tag);
 			xs << xml::CR();
-		xs.startDivision(false);
+			xs << XMLStream::ESCAPE_NONE << os2.str();
-		generateDocBookParagraphWithoutSectioning(text, buf, xs, runparams, paragraphs, bpitAbstract, epitAbstract);
-		xs.endDivision();
 			xs << xml::EndTag(tag);
 			xs << xml::CR();
 		}
+	}
 
 	// End the <info> tag if it was started.
 	if (needInfo) {