Fixed memory leak: widget factories need to be deleted

in opentxClose()

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;
+    }
+  }
+}