the real bug behind so many apparent crashtest discoveries

the tests are done headless with dbgutil enabled and
this dialog contents dumped in dbgutil mode tries to
spit out the contents of the various "file format
not known", "file busted" dialogs with some bad casts
and falls over and dies

Change-Id: I353619f0209902d4c099b42064fd48c3c547f846

vcl/source/window/dialog.cxx

@@ -57,15 +57,22 @@ static OString ImplGetDialogText( Dialog* pDialog )
 {
     OStringBuffer aErrorStr(OUStringToOString(
         pDialog->GetText(), RTL_TEXTENCODING_UTF8));
-    if ( (pDialog->GetType() == WINDOW_MESSBOX) ||
-         (pDialog->GetType() == WINDOW_INFOBOX) ||
-         (pDialog->GetType() == WINDOW_WARNINGBOX) ||
-         (pDialog->GetType() == WINDOW_ERRORBOX) ||
-         (pDialog->GetType() == WINDOW_QUERYBOX) )
+
+    OUString sMessage;
+    if (MessBox* pMessBox = dynamic_cast<MessBox*>(pDialog))
+    {
+        sMessage = pMessBox->GetMessText();
+    }
+    else if (MessageDialog* pMessDialog = dynamic_cast<MessageDialog*>(pDialog))
+    {
+        sMessage = pMessDialog->get_primary_text();
+    }
+
+    if (!sMessage.isEmpty())
     {
         aErrorStr.append(", ");
         aErrorStr.append(OUStringToOString(
-            static_cast<MessBox*>(pDialog)->GetMessText(), RTL_TEXTENCODING_UTF8));
+            sMessage, RTL_TEXTENCODING_UTF8));
     }
     return aErrorStr.makeStringAndClear();
 }