Fix CMME importer crash with chord within ligature

src/iocmme.cpp

@@ -524,22 +524,28 @@ void CmmeInput::CreateBreak(pugi::xml_node breakNode)
 void CmmeInput::CreateChord(pugi::xml_node chordNode)
 {
     assert(m_currentContainer);
-
-    Chord *chord = new Chord();
-    m_currentContainer->AddChild(chord);
-    m_currentContainer = chord;
+
+    // CMME can have 'chords' in ligatures - we keep only the first note
+    bool inLigature = (m_currentContainer->Is(LIGATURE));
+
+    if (!inLigature) {
+        Chord *chord = new Chord();
+        m_currentContainer->AddChild(chord);
+        m_currentContainer = chord;
+    }
     pugi::xpath_node_set events = chordNode.select_nodes("./*");
     for (pugi::xpath_node event : events) {
         pugi::xml_node eventNode = event.node();
         std::string name = eventNode.name();
         if (name == "Note") {
             CreateNote(eventNode);
+            if (inLigature) break;
         }
         else {
             LogWarning("Unsupported chord component: '%s'", name.c_str());
         }
     }
-    m_currentContainer = m_currentContainer->GetParent();
+    if (!inLigature) m_currentContainer = m_currentContainer->GetParent();
 }
 
 void CmmeInput::CreateClef(pugi::xml_node clefNode)