Another try at committing this

Reverted previous 'fixes' now that the array bug has been cured
Prevented dragging dividers outside cells (this would cause an assert)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@17134 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/grid.cpp

@@ -3092,8 +3092,7 @@ bool wxGridStringTable::DeleteRows( size_t pos, size_t numRows )
 
     if ( numRows >= curNumRows )
     {
-        for (size_t i=0; i< m_data.GetCount(); i++) m_data[i].Clear();
+        m_data.Clear();  // don't release memory just yet
-        m_data.Empty();  // don't release memory just yet
     }
     else
     {