vcl: assert when LogicToPixel overflows

Change-Id: I86d1c3e0c177c671b280c05b47312c79389884ed

sw/source/core/layout/pagechg.cxx

@@ -2177,7 +2177,7 @@ void SwRootFrm::CheckViewLayout( const SwViewOption* pViewOpt, const SwRect* pVi
             pSh->SetFirstVisPageInvalid();
             if (bOldCallbackActionEnabled)
             {
-                pSh->InvalidateWindows( SwRect( 0, 0, LONG_MAX, LONG_MAX ) );
+                pSh->InvalidateWindows( SwRect( 0, 0, INT_MAX, INT_MAX ) );
                 pSh->GetDoc()->GetDocShell()->Broadcast(SfxSimpleHint(SFX_HINT_DOCCHANGED));
             }
         }

vcl/source/outdev/map.cxx

@@ -381,6 +381,8 @@ static long ImplLogicToPixel( long n, long nDPI, long nMapNum, long nMapDenom,
        }
     }
     else
+#else
+    assert(n < std::numeric_limits<long>::max() / nMapNum); //detect overflows
 #endif
     {
        sal_Int64 n64 = n;