Resolves: tdf#117046 messages set after dialog created should affect size

Change-Id: I03688ec1d869720b4a042602ff1da15727174592
Reviewed-on: https://gerrit.libreoffice.org/53046Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/window/layout.cxx

@@ -2451,6 +2451,7 @@ void MessageDialog::set_primary_text(const OUString &rPrimaryString)
     {
         m_pPrimaryMessage->SetText(m_sPrimaryString);
         m_pPrimaryMessage->Show(!m_sPrimaryString.isEmpty());
+        MessageDialog::SetMessagesWidths(this, m_pPrimaryMessage, !m_sSecondaryString.isEmpty() ? m_pSecondaryMessage.get() : nullptr);
     }
 }
 
@@ -2461,6 +2462,7 @@ void MessageDialog::set_secondary_text(const OUString &rSecondaryString)
     {
         m_pSecondaryMessage->SetText("\n" + m_sSecondaryString);
         m_pSecondaryMessage->Show(!m_sSecondaryString.isEmpty());
+        MessageDialog::SetMessagesWidths(this, m_pPrimaryMessage, !m_sSecondaryString.isEmpty() ? m_pSecondaryMessage.get() : nullptr);
     }
 }