[gnote] Move semantics for NoteAddin

[Aurimas Černius <aurimasc src gnome org>]

commit 757feedd58752300b6c16a9426aa1d7a40efc698
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Sun May 22 22:21:58 2022 +0300

    Move semantics for NoteAddin

 src/noteaddin.cpp | 6 +++---
 src/noteaddin.hpp | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/src/noteaddin.cpp b/src/noteaddin.cpp
index ddb60ca0..9513fec0 100644
--- a/src/noteaddin.cpp
+++ b/src/noteaddin.cpp
@@ -1,7 +1,7 @@
 /*
  * gnote
  *
- * Copyright (C) 2012-2016,2019 Aurimas Cernius
+ * Copyright (C) 2012-2016,2019,2022 Aurimas Cernius
  * Copyright (C) 2009 Hubert Figuiere
  *
  * This program is free software: you can redistribute it and/or modify
@@ -175,9 +175,9 @@ namespace gnote {
     return std::vector<gnote::PopoverWidget>();
   }
 
-  void NoteAddin::register_main_window_action_callback(const Glib::ustring & action, sigc::slot<void, const 
Glib::VariantBase&> callback)
+  void NoteAddin::register_main_window_action_callback(const Glib::ustring & action, sigc::slot<void, const 
Glib::VariantBase&> && callback)
   {
-    m_action_callbacks.emplace_back(action, callback);
+    m_action_callbacks.emplace_back(action, std::move(callback));
   }
   
 }
diff --git a/src/noteaddin.hpp b/src/noteaddin.hpp
index 50e854cd..fba5e42f 100644
--- a/src/noteaddin.hpp
+++ b/src/noteaddin.hpp
@@ -1,7 +1,7 @@
 /*
  * gnote
  *
- * Copyright (C) 2012-2016,2019,2021 Aurimas Cernius
+ * Copyright (C) 2012-2016,2019,2021-2022 Aurimas Cernius
  * Copyright (C) 2009 Hubert Figuiere
  *
  * This program is free software: you can redistribute it and/or modify
@@ -72,7 +72,7 @@ public:
   virtual void on_note_opened () = 0;
 
   virtual std::vector<PopoverWidget> get_actions_popover_widgets() const;
-  void register_main_window_action_callback(const Glib::ustring & action, sigc::slot<void, const 
Glib::VariantBase&> callback);
+  void register_main_window_action_callback(const Glib::ustring & action, sigc::slot<void, const 
Glib::VariantBase&> && callback);
 
   const Note::Ptr & get_note() const
     {