ofz: returning SfxPoolItem belonging to local

Change-Id: Ib9760efb1231ef057dfd62d06095c15e3bf73a87
Reviewed-on: https://gerrit.libreoffice.org/43426Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

sw/source/filter/ww8/ww8par.cxx

@@ -1496,9 +1496,9 @@ const SfxPoolItem* SwWW8FltControlStack::GetFormatAttr(const SwPosition& rPos,
             if (pNd->IsTextNode())
             {
                 const sal_Int32 nPos = rPos.nContent.GetIndex();
-                SfxItemSet aSet(pDoc->GetAttrPool(), nWhich, nWhich);
-                if (pNd->GetTextNode()->GetAttr(aSet, nPos, nPos))
-                    pItem = aSet.GetItem(nWhich);
+                m_xScratchSet.reset(new SfxItemSet(pDoc->GetAttrPool(), nWhich, nWhich));
+                if (pNd->GetTextNode()->GetAttr(*m_xScratchSet, nPos, nPos))
+                    pItem = m_xScratchSet->GetItem(nWhich);
             }
 
             if (!pItem)

sw/source/filter/ww8/ww8par.hxx

@@ -357,6 +357,7 @@ class SwWW8FltControlStack : public SwFltControlStack
 {
 private:
     SwWW8ImplReader& rReader;
+    std::unique_ptr<SfxItemSet> m_xScratchSet;
     sal_uInt16 nToggleAttrFlags;
     sal_uInt16 nToggleBiDiAttrFlags;
     SwWW8FltControlStack(const SwWW8FltControlStack&) = delete;