loplugin:useuniqueptr in ScAccessiblePreviewHeaderCell

Change-Id: Id1ccd3657ffb0a5ae4762ea6ce25f8ce2c77db92
Reviewed-on: https://gerrit.libreoffice.org/56548
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

sc/source/ui/Accessibility/AccessiblePreviewHeaderCell.cxx

@@ -87,8 +87,7 @@ void SAL_CALL ScAccessiblePreviewHeaderCell::disposing()
         mpViewShell = nullptr;
     }
 
-       if (mpTableInfo)
-        DELETEZ (mpTableInfo);
+    mpTableInfo.reset();
 
     ScAccessibleContextBase::disposing();
 }
@@ -107,7 +106,7 @@ void ScAccessiblePreviewHeaderCell::Notify( SfxBroadcaster& rBC, const SfxHint&
     {
         //  column / row layout may change with any document change,
         //  so it must be invalidated
-        DELETEZ( mpTableInfo );
+        mpTableInfo.reset();
     }
 
     ScAccessibleContextBase::Notify(rBC, rHint);
@@ -404,7 +403,7 @@ void ScAccessiblePreviewHeaderCell::FillTableInfo() const
             aOutputSize = pWindow->GetOutputSizePixel();
         tools::Rectangle aVisRect( Point(), aOutputSize );
 
-        mpTableInfo = new ScPreviewTableInfo;
+        mpTableInfo.reset( new ScPreviewTableInfo );
         mpViewShell->GetLocationData().GetTableInfo( aVisRect, *mpTableInfo );
     }
 }

sc/source/ui/inc/AccessiblePreviewHeaderCell.hxx

@@ -119,7 +119,7 @@ private:
     ScAddress           maCellPos;
     bool                mbColumnHeader;
     bool                mbRowHeader;
-    mutable ScPreviewTableInfo* mpTableInfo;
+    mutable std::unique_ptr<ScPreviewTableInfo> mpTableInfo;
 
     bool IsDefunc(
         const css::uno::Reference<css::accessibility::XAccessibleStateSet>& rxParentStates);