SwTxtNode::CutImpl: check for max text limit

Unfortunately i don't see an easy way to handle the problem, let's hope
it doesn't happen in practice.

Change-Id: I86e58c241fda6d07d83fb383421f0a5a810b581a

sw/source/core/txtnode/ndtxt.cxx

@@ -1984,6 +1984,11 @@ void SwTxtNode::CutImpl( SwTxtNode * const pDest, const SwIndex & rDestStart,
         pDest->m_Text = pDest->m_Text.replaceAt(nDestStart, 0,
                             m_Text.copy(nTxtStartIdx, nLen));
         m_Text = m_Text.replaceAt(nTxtStartIdx, nLen, "");
+        if (m_Text.getLength() > TXTNODE_MAX)
+        {   // FIXME: could only happen when called from SwRedline::Show.
+            // unfortunately can't really do anything here to handle that...
+            abort();
+        }
         nLen = pDest->m_Text.getLength() - nInitSize; // update w/ current size!
         if( !nLen )                 // String nicht gewachsen ??
             return;