use tools::SvRef in ImpSdrObjTextLinkUserData

since the field is SvRefBase-derived

Change-Id: Ie84c48daf93e3805b2db240a497a8496779fe750

include/svx/svdotext.hxx

@@ -32,6 +32,7 @@
 #include <svx/svxdllapi.h>
 #include <drawinglayer/primitive2d/baseprimitive2d.hxx>
 #include <svx/svdpagv.hxx>
+#include <rtl/ref.hxx>
 
 
 //   forward declarations
@@ -105,7 +106,7 @@ class ImpSdrObjTextLinkUserData : public SdrObjUserData
     OUString                    aFileName;   // Name des referenzierten Dokuments
     OUString                    aFilterName; // ggf. ein Filter
     DateTime                    aFileDate0;  // Unnoetiges neuladen vermeiden
-    std::unique_ptr<ImpSdrObjTextLink>
+    tools::SvRef<ImpSdrObjTextLink>
                                 pLink;
     rtl_TextEncoding            eCharSet;
 

svx/source/svdraw/svdotxln.cxx

@@ -257,7 +257,7 @@ void SdrTextObj::ImpLinkAnmeldung()
     ImpSdrObjTextLinkUserData* pData=GetLinkUserData();
     sfx2::LinkManager* pLinkManager=pModel!=nullptr ? pModel->GetLinkManager() : nullptr;
     if (pLinkManager!=nullptr && pData!=nullptr && pData->pLink==nullptr) { // don't register twice
-        pData->pLink.reset( new ImpSdrObjTextLink(this) );
+        pData->pLink = new ImpSdrObjTextLink(this);
         pLinkManager->InsertFileLink(*pData->pLink,OBJECT_CLIENT_FILE,pData->aFileName,
                                      !pData->aFilterName.isEmpty() ?
                                       &pData->aFilterName : nullptr);