Output arguments required by arguments with default or preset arg

Fixes: #9128

src/output_latex.cpp

@@ -331,6 +331,18 @@ void getArgInsets(otexstream & os, OutputParams const & runparams, Layout::LaTeX
 	if (argnr == 0)
 		return;
 
+	// Default and preset args are always output, so if they require
+	// other arguments, consider this.
+	Layout::LaTeXArgMap::const_iterator lit = latexargs.begin();
+	Layout::LaTeXArgMap::const_iterator const lend = latexargs.end();
+	for (; lit != lend; ++lit) {
+		Layout::latexarg arg = (*lit).second;
+		if ((!arg.presetarg.empty() || !arg.defaultarg.empty()) && !arg.requires.empty()) {
+				vector<string> req = getVectorFromString(arg.requires);
+				required.insert(required.end(), req.begin(), req.end());
+			}
+	}
+
 	for (unsigned int i = 1; i <= argnr; ++i) {
 		map<int, InsetArgument const *>::const_iterator lit = ilist.find(i);
 		bool inserted = false;

status.21x

@@ -86,6 +86,8 @@ What's new
 
 - Fix some nesting problems in reversion of some beamer environments to 2.0 format.
 
+- Output arguments required by arguments with DefaultArg or PresetArg (bug 9128).
+
 
 * USER INTERFACE