Use default constructors for wxSize/Point/Rect.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31904 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/grid.cpp

@@ -10196,7 +10196,7 @@ wxRect wxGrid::BlockToDeviceRect( const wxGridCellCoords &topLeft,
     }
     else
     {
-        rect = wxRect( 0, 0, 0, 0 );
+        rect = wxRect();
     }
 
     cellRect = CellToRect( bottomRight );
@@ -10271,7 +10271,7 @@ wxRect wxGrid::BlockToDeviceRect( const wxGridCellCoords &topLeft,
     m_gridWin->GetClientSize( &cw, &ch );
 
     if (right < 0 || bottom < 0 || left > cw || top > ch)
-        return wxRect( 0, 0, 0, 0);
+        return wxRect();
 
     rect.SetLeft( wxMax(0, left) );
     rect.SetTop( wxMax(0, top) );