merge IUndoManager into SfxUndoManager

SfxUndoManager is the only implementation of the IUnderManager
"interface", and it lives in the same header.
Plus this way we can get rid of some covariant parameters,
which will make using std::unique_ptr easier.

Change-Id: I6661b9876b18da830bead78794d237886cd3c5c9
Reviewed-on: https://gerrit.libreoffice.org/57317
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/starmath/inc/document.hxx b/starmath/inc/document.hxx
index 95d6af49b1e7..5f7e91ff83c1 100644
--- a/starmath/inc/document.hxx
+++ b/starmath/inc/document.hxx
@@ -193,7 +193,7 @@ public:
 
     void        Repaint();
 
-    virtual ::svl::IUndoManager *GetUndoManager () override;
+    virtual SfxUndoManager *GetUndoManager () override;
 
     static SfxItemPool& GetPool();