[LyX/master] Fix iterator invalidation.

[Juergen Spitzmueller]

commit 21f62c7184859eb8aadcf8c6efba2f3cdd810da4
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Sun Apr 6 19:21:47 2014 +0200

    Fix iterator invalidation.

diff --git a/src/insets/InsetLayout.cpp b/src/insets/InsetLayout.cpp
index 6f1a02f..d579132 100644
--- a/src/insets/InsetLayout.cpp
+++ b/src/insets/InsetLayout.cpp
@@ -596,8 +596,9 @@ Layout::LaTeXArgMap InsetLayout::args() const
 unsigned int InsetLayout::optArgs() const
 {
        unsigned int nr = 0;
-       Layout::LaTeXArgMap::const_iterator it = args().begin();
-       for (; it != args().end(); ++it) {
+       Layout::LaTeXArgMap const args = InsetLayout::args();
+       Layout::LaTeXArgMap::const_iterator it = args.begin();
+       for (; it != args.end(); ++it) {
                if (!(*it).second.mandatory)
                        ++nr;
        }
@@ -608,8 +609,9 @@ unsigned int InsetLayout::optArgs() const
 unsigned int InsetLayout::requiredArgs() const
 {
        unsigned int nr = 0;
-       Layout::LaTeXArgMap::const_iterator it = args().begin();
-       for (; it != args().end(); ++it) {
+       Layout::LaTeXArgMap const args = InsetLayout::args();
+       Layout::LaTeXArgMap::const_iterator it = args.begin();
+       for (; it != args.end(); ++it) {
                if ((*it).second.mandatory)
                        ++nr;
        }