Fix crash during polygon handle travelling.

Improving on 7d5922ca wrt. bound
checking and non-truncation of index magic values.

Change-Id: If33495075472fdf242b2de0893fd44109ec7bc83

svx/inc/svx/svdhdl.hxx

@@ -480,7 +480,7 @@ public:
     //             3.Level Position (x+y)
     void     Sort();
     sal_uIntPtr    GetHdlCount() const                       { return aList.size(); }
-    SdrHdl*  GetHdl(sal_uIntPtr nNum) const                  { return aList[nNum]; }
+    SdrHdl*  GetHdl(sal_uIntPtr nNum) const                  { return nNum != CONTAINER_ENTRY_NOTFOUND ? aList[nNum] : NULL; }
     sal_uIntPtr    GetHdlNum(const SdrHdl* pHdl) const;
     void     SetHdlSize(sal_uInt16 nSiz);
     sal_uInt16   GetHdlSize() const                        { return nHdlSize; }

svx/source/svdraw/svdhdl.cxx

@@ -1911,7 +1911,7 @@ void SdrHdlList::TravelFocusHdl(sal_Bool bForward)
         }
 
         // build new HdlNum
-        sal_uInt32 nNewHdlNum(nNewHdl);
+        sal_uIntPtr nNewHdlNum(nNewHdl);
 
         // look for old num in sorted array
         if(nNewHdl != CONTAINER_ENTRY_NOTFOUND)
@@ -2020,7 +2020,7 @@ void SdrHdlList::SetHdlSize(sal_uInt16 nSiz)
         nHdlSize = nSiz;
 
         // propagate change to IAOs
-        for(sal_uInt32 i=0; i<GetHdlCount(); i++)
+        for(sal_uIntPtr i=0; i<GetHdlCount(); i++)
         {
             SdrHdl* pHdl = GetHdl(i);
             pHdl->Touch();
@@ -2036,7 +2036,7 @@ void SdrHdlList::SetMoveOutside(sal_Bool bOn)
         bMoveOutside = bOn;
 
         // propagate change to IAOs
-        for(sal_uInt32 i=0; i<GetHdlCount(); i++)
+        for(sal_uIntPtr i=0; i<GetHdlCount(); i++)
         {
             SdrHdl* pHdl = GetHdl(i);
             pHdl->Touch();