Fixed memory leak: widget factories need to be deleted

in opentxClose()

radio/src/gui/colorlcd/widget.h

@@ -126,6 +126,8 @@ class WidgetFactory
       registerWidget(this);
     }
 
+    virtual ~WidgetFactory() {}
+
     inline const char * getName() const
     {
         return name;

radio/src/lua/lua_api.h

@@ -187,6 +187,9 @@ void registerBitmapClass(lua_State * L);
 void luaSetInstructionsLimit(lua_State* L, int count);
 int luaLoadScriptFileToState(lua_State * L, const char * filename, const char * mode);
 
+// Unregister LUA widget factories
+void luaUnregisterWidgets();
+
 #if LCD_W > 350
   #define RADIO_TOOL_NAME_MAXLEN  40
 #else

radio/src/lua/widgets.cpp

@@ -512,3 +512,13 @@ void luaInitThemesAndWidgets()
     luaDoGc(lsWidgets, true);
   }
 }
+
+void luaUnregisterWidgets()
+{
+  std::list<const WidgetFactory *> regWidgets(getRegisteredWidgets());
+  for (auto w : regWidgets) {
+    if (dynamic_cast<const LuaWidgetFactory*>(w)) {
+      delete w;
+    }
+  }
+}

radio/src/opentx.cpp

@@ -1518,6 +1518,8 @@ void opentxClose(uint8_t shutdown)
 
   //TODO: In fact we want only to empty the trash (private method)
   MainWindow::instance()->run();
+
+  luaUnregisterWidgets();
   luaClose(&lsWidgets);
 #endif