loplugin:useuniqueptr in SwPostItMgr

Change-Id: I567ec14112ee8d5224c19c7616fd8ed06619c228
Reviewed-on: https://gerrit.libreoffice.org/44822Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

sw/inc/PostItMgr.hxx

@@ -25,6 +25,7 @@
 
 #include <cstddef>
 #include <list>
+#include <memory>
 #include <vector>
 #include <editeng/outlobj.hxx>
 #include <rtl/ustring.hxx>
@@ -163,7 +164,7 @@ class SwPostItMgr: public SfxListener
         bool                            mbIsShowAnchor;
 
         // data structure to collect the <SwAnnotationWin> instances for certain <SwFrame> instances.
-        sw::sidebarwindows::SwFrameSidebarWinContainer* mpFrameSidebarWinContainer;
+        std::unique_ptr<sw::sidebarwindows::SwFrameSidebarWinContainer> mpFrameSidebarWinContainer;
 
         void            AddPostIts(bool bCheckExistence = true,bool bFocus = true);
         void            RemoveSidebarWin();

sw/source/uibase/docvw/PostItMgr.cxx

@@ -238,9 +238,6 @@ SwPostItMgr::~SwPostItMgr()
     for (auto const& page : mPages)
         delete page;
     mPages.clear();
-
-    delete mpFrameSidebarWinContainer;
-    mpFrameSidebarWinContainer = nullptr;
 }
 
 void SwPostItMgr::CheckForRemovedPostIts()
@@ -2313,7 +2310,7 @@ void SwPostItMgr::ConnectSidebarWinToFrame( const SwFrame& rFrame,
 {
     if ( mpFrameSidebarWinContainer == nullptr )
     {
-        mpFrameSidebarWinContainer = new SwFrameSidebarWinContainer();
+        mpFrameSidebarWinContainer.reset(new SwFrameSidebarWinContainer());
     }
 
     const bool bInserted = mpFrameSidebarWinContainer->insert( rFrame, rFormatField, rSidebarWin );