Add fixltx2e module which simply loads fixltx2e.sty.

This module can be used instead of \usepackage{fixltx2e} in the preamble
to avoid duplicate definitions of \textsubscript.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@36550 a592a061-630c-0410-9148-cb99ea01b6c8

development/scons/scons_manifest.py

@@ -2926,6 +2926,7 @@ lib_layouts_module_files = Split('''
     endnotes.module
     eqs-within-sections.module
     figs-within-sections.module
+    fixltx2e.module
     foottoend.module
     hanging.module
     initials.module

lib/Makefile.am

@@ -1098,6 +1098,7 @@ dist_layouts_DATA =\
 	layouts/extletter.layout \
 	layouts/extreport.layout \
 	layouts/figs-within-sections.module \
+	layouts/fixltx2e.module \
 	layouts/foils.layout \
 	layouts/foottoend.module \
 	layouts/frletter.layout \

lib/layouts/fixltx2e.module

@@ -0,0 +1,14 @@
+#\DeclareLyXModule{Fix LaTeX}
+#DescriptionBegin
+#Loads the LaTeX package fixltx2e which contains some bug fixes for LaTeX.
+#Those fixes are not part of the LaTeX kernel because of backward compatibility.
+#If you use this module your typeset document may look different
+#when you process it with future LaTeX versions, because fixltx2e may provide
+#more bugfixes in future versions.
+#DescriptionEnd
+
+# Author : Georg Baum <baum@lyx.org>
+
+Format 30
+
+Requires fixltx2e

src/LaTeXFeatures.cpp

@@ -575,7 +575,7 @@ char const * simplefeatures[] = {
 	"framed",
 	"soul",
 	"textcomp",
-	"subscript",
+	"fixltx2e",
 	"pmboxdraw",
 	"bbding",
 	"ifsym",
@@ -823,6 +823,10 @@ string const LaTeXFeatures::getPackages() const
 			    "\\makenomenclature\n";
 	}
 
+	// fixltx2e provides subscript
+	if (mustProvide("subscript") && !isRequired("fixltx2e"))
+		packages << "\\usepackage{subscript}\n";
+
 	return packages.str();
 }