Coverity: Not restoring ostream format

src/App/Expression.cpp

@@ -31,6 +31,7 @@
 #endif
 
 #include <boost/algorithm/string/predicate.hpp>
+#include <boost/io/ios_state.hpp>
 
 #include <Base/Console.h>
 #include "Base/Exception.h"
@@ -1362,6 +1363,7 @@ void NumberExpression::_toString(std::ostream &ss, bool,int) const
     // https://en.cppreference.com/w/cpp/types/numeric_limits/digits10
     // https://en.cppreference.com/w/cpp/types/numeric_limits/max_digits10
     // https://www.boost.org/doc/libs/1_63_0/libs/multiprecision/doc/html/boost_multiprecision/tut/limits/constants.html
+    boost::io::ios_flags_saver ifs(ss);
     ss << std::setprecision(std::numeric_limits<double>::digits10 + 1) << getValue();
 
     /* Trim of any extra spaces */