[glom] ImageGlom: Use std::unique_ptr<> instead of naked new.

[Murray Cumming <murrayc src gnome org>]

commit e542cfffb53b5622c1575502e0ad6082341baba3
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Feb 5 11:04:35 2016 +0100

    ImageGlom: Use std::unique_ptr<> instead of naked new.
    
    I am not very happy with passing the raw pointer to gtkmm's
    attach_to_widget(), but that seems to be the normal use of
    unique_ptr<>::operator*() and unique_ptr<>::get(),
    as long as we don't expect the receiving API to take any
    ownership.

 glom/utility_widgets/imageglom.cc |    9 +++------
 glom/utility_widgets/imageglom.h  |    2 +-
 2 files changed, 4 insertions(+), 7 deletions(-)
---
diff --git a/glom/utility_widgets/imageglom.cc b/glom/utility_widgets/imageglom.cc
index ba76c18..3149d1b 100644
--- a/glom/utility_widgets/imageglom.cc
+++ b/glom/utility_widgets/imageglom.cc
@@ -49,8 +49,7 @@ ImageGlom::type_vec_ustrings ImageGlom::m_gdkpixbuf_supported_mime_types;
 
 ImageGlom::ImageGlom()
 : m_ev_view(nullptr),
-  m_ev_document_model(nullptr),
-  m_pMenuPopup_UserMode(nullptr)
+  m_ev_document_model(nullptr)
 {
   init();
 }
@@ -58,8 +57,7 @@ ImageGlom::ImageGlom()
 ImageGlom::ImageGlom(BaseObjectType* cobject, const Glib::RefPtr<Gtk::Builder>& /* builder */)
 : Gtk::EventBox(cobject),
   m_ev_view(nullptr),
-  m_ev_document_model(nullptr),
-  m_pMenuPopup_UserMode(nullptr)
+  m_ev_document_model(nullptr)
 {
   init();
 }
@@ -97,7 +95,6 @@ void ImageGlom::init()
 
 ImageGlom::~ImageGlom()
 {
-  delete m_pMenuPopup_UserMode;
 }
 
 void ImageGlom::set_layout_item(const std::shared_ptr<LayoutItem>& layout_item, const Glib::ustring& 
table_name)
@@ -948,7 +945,7 @@ void ImageGlom::setup_menu_usermode()
   menu->append(_("_Paste"), "context.paste");
   menu->append(_("_Clear"), "context.clear");
 
-  m_pMenuPopup_UserMode = new Gtk::Menu(menu);
+  m_pMenuPopup_UserMode = std::make_unique<Gtk::Menu>(menu);
   m_pMenuPopup_UserMode->attach_to_widget(*this);
 }
 
diff --git a/glom/utility_widgets/imageglom.h b/glom/utility_widgets/imageglom.h
index 7f9504e..d57a365 100644
--- a/glom/utility_widgets/imageglom.h
+++ b/glom/utility_widgets/imageglom.h
@@ -118,7 +118,7 @@ private:
   Glib::RefPtr<Gdk::Pixbuf> m_pixbuf_clipboard; //When copy is used, store it here until it is pasted.
 
 
-  Gtk::Menu* m_pMenuPopup_UserMode;
+  std::unique_ptr<Gtk::Menu> m_pMenuPopup_UserMode;
 
   //TODO: Use just the Gio::ActionGroup type when it derives from Gio::ActionMap. 
   Glib::RefPtr<Gio::SimpleActionGroup> m_refActionGroup_UserModePopup;