pass SwField around by std::unique_ptr

Fix leak in SwFieldPage::InsertField, where it interacts badly with
SwFieldMgr::UpdateCurField

The awkward
return std::unique_ptr<SwField>(pTmp.release());
code is because clang 3.8.0 doesn't seem able to do auto-upcast of
std::unique_ptr.

Change-Id: I05b748e9cda145fd972a01bfa343239df32368b9
Reviewed-on: https://gerrit.libreoffice.org/57197
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/sw/inc/SwUndoField.hxx b/sw/inc/SwUndoField.hxx
index e9ef5d8dcb38..f27aed1a830c 100644
--- a/sw/inc/SwUndoField.hxx
+++ b/sw/inc/SwUndoField.hxx
@@ -43,7 +43,7 @@ public:
 
 class SwUndoFieldFromDoc : public SwUndoField
 {
-    SwField * pOldField, * pNewField;
+    std::unique_ptr<SwField> pOldField, pNewField;
     SwMsgPoolItem * pHint;
     bool bUpdate;