Fix memory leak in Math, by holding SmModel pointer

And deleting this in destructor of SmDocShell

Change-Id: Ida96648c7aae90fb5b0afac916587bbb049f90b3
Reviewed-on: https://gerrit.libreoffice.org/5088
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>

starmath/inc/document.hxx

@@ -39,6 +39,7 @@
 #include "format.hxx"
 #include "parse.hxx"
 #include "smmod.hxx"
+#include "unomodel.hxx"
 
 class SmNode;
 class SfxMenuBarManager;
@@ -95,6 +96,7 @@ class SmDocShell : public SfxObjectShell, public SfxListener
     OUString            aText;
     SmFormat            aFormat;
     SmParser            aInterpreter;
+    SmModel            *pModel;
     OUString            aAccText;
     SmNode             *pTree;
     SfxMenuBarManager  *pMenuMgr;

starmath/source/document.cxx

@@ -684,6 +684,7 @@ void SmDocShell::Repaint()
 
 SmDocShell::SmDocShell( const sal_uInt64 i_nSfxCreationFlags ) :
     SfxObjectShell( i_nSfxCreationFlags ),
+    pModel              ( new SmModel(this) ),
     pTree               ( 0 ),
     pEditEngineItemPool ( 0 ),
     pEditEngine         ( 0 ),
@@ -703,11 +704,9 @@ SmDocShell::SmDocShell( const sal_uInt64 i_nSfxCreationFlags ) :
     StartListening(aFormat);
     StartListening(*pp->GetConfig());
 
-    SetBaseModel( new SmModel(this) );
+    SetBaseModel( pModel );
 }
 
-
-
 SmDocShell::~SmDocShell()
 {
     SAL_INFO( "starmath", "starmath: SmDocShell::~SmDocShell" );
@@ -717,7 +716,6 @@ SmDocShell::~SmDocShell()
     EndListening(aFormat);
     EndListening(*pp->GetConfig());
 
-
     if(pCursor)
         delete pCursor;
     pCursor = NULL;
@@ -726,6 +724,7 @@ SmDocShell::~SmDocShell()
     SfxItemPool::Free(pEditEngineItemPool);
     delete pTree;
     delete pPrinter;
+    delete pModel;
 }