loplugin:useuniqueptr in SdrDragView

and fix potential leak on early return in SdrDragView::BegDragObj

Change-Id: I707be6e2c7dc2c251f37447fe3cd98c4b50b59d1
Reviewed-on: https://gerrit.libreoffice.org/53751Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/svx/svddrgv.hxx

@@ -22,6 +22,7 @@
 
 #include <svx/svxdllapi.h>
 #include <svx/svdxcgv.hxx>
+#include <memory>
 
 class SdrUndoGeoObj;
 
@@ -38,7 +39,7 @@ class SVX_DLLPUBLIC SdrDragView : public SdrExchangeView
 
 protected:
     SdrHdl*                     mpDragHdl;
-    SdrDragMethod*              mpCurrentSdrDragMethod;
+    std::unique_ptr<SdrDragMethod> mpCurrentSdrDragMethod;
     SdrUndoGeoObj*              mpInsPointUndo;
     tools::Rectangle            maDragLimit;
     OUString                    maInsPointUndoStr;
@@ -104,7 +105,7 @@ public:
     void BrkDragObj();
     bool IsDragObj() const { return mpCurrentSdrDragMethod && !mbInsPolyPoint && !mbInsGluePoint; }
     SdrHdl* GetDragHdl() const { return mpDragHdl; }
-    SdrDragMethod* GetDragMethod() const { return mpCurrentSdrDragMethod; }
+    SdrDragMethod* GetDragMethod() const { return mpCurrentSdrDragMethod.get(); }
     bool IsDraggingPoints() const { return meDragHdl==SdrHdlKind::Poly; }
     bool IsDraggingGluePoints() const { return meDragHdl==SdrHdlKind::Glue; }
 

svx/source/svdraw/svdview.cxx

@@ -1192,7 +1192,7 @@ OUString SdrView::GetStatusText()
             {
                 SAL_INFO(
                     "svx.svdraw",
-                    "(" << this << ") " << mpCurrentSdrDragMethod);
+                    "(" << this << ") " << mpCurrentSdrDragMethod.get());
                 mpCurrentSdrDragMethod->TakeSdrDragComment(aStr);
             }
         }