[Thermo] Add Phase::nativeMode / fix glitch

Prevent automatic alphabetic ordering of states in
SolutionArray::componentNames

include/cantera/thermo/Phase.h

@@ -291,6 +291,11 @@ class Phase
     //! and restoreState().
     virtual std::map<std::string, size_t> nativeState() const;
 
+    //! Return string acronym representing native state
+    //! @see nativeState
+    //! @since  New in Cantera 3.0
+    string nativeMode() const;
+
     //! Return a vector containing full states defining a phase.
     //! Full states list combinations of properties that allow for the
     //! specification of a thermodynamic state based on user input.

src/base/SolutionArray.cpp

@@ -216,8 +216,8 @@ vector<string> SolutionArray::componentNames() const
 
     // state information
     auto phase = m_sol->thermo();
-    const auto& nativeState = phase->nativeState();
-    for (auto& [name, value] : nativeState) {
+    for (auto code : phase->nativeMode()) {
+        string name = string(1, code);
         if (name == "X" || name == "Y") {
             for (auto& spc : phase->speciesNames()) {
                 components.push_back(spc);

src/thermo/Phase.cpp

@@ -196,6 +196,19 @@ std::map<std::string, size_t> Phase::nativeState() const
     }
 }
 
+string Phase::nativeMode() const
+{
+    map<size_t, string> states; // reverse lookup
+    for (auto& [name, value] : nativeState()) {
+        states[value] = name;
+    }
+    string out;
+    for (auto& [value, name] : states) {
+        out += name;
+    }
+    return out;
+}
+
 vector<std::string> Phase::fullStates() const
 {
     if (isPure()) {