Fixed crash that happens when changing a component name

src/Screens/ModelEditorScreen.cpp

@@ -142,7 +142,9 @@ static void DrawTopLevelMembersEditor(osc::UndoableUiModel& st)
     {
         if (std::strlen(nambuf) > 0)
         {
-            st.updSelected()->setName(nambuf);
+            OpenSim::Component* selectedComponent = st.updSelected();
+            selectedComponent->setName(nambuf);
+            st.setSelected(selectedComponent);  // CARE: the selection depends on the name of the component
             st.commit("changed component name");
         }
     }
@@ -1242,6 +1244,12 @@ class osc::ModelEditorScreen::Impl final {
             DrawTopLevelMembersEditor(uim);
         }
 
+        // top-level member edits may have changed this
+        if (!uim.getSelected())
+        {
+            return;
+        }
+
         // property editors
         {
             auto maybeUpdater = m_ObjectPropsEditor.draw(*uim.getSelected());