write uuid only in partterminal to xml, because in the other case it is not needed

sources/editor/graphicspart/partterminal.cpp

@@ -44,6 +44,14 @@ PartTerminal::~PartTerminal() {
 	@param xml_elmt Element XML a lire
 */
 bool PartTerminal::fromXml(const QDomElement &xml_elmt) {
+
+    QUuid uuid;
+    // update part and add uuid, which is used in the new version to connect terminals together
+    // if the attribute not exists, means, the element is created with an older version of qet. So use the legacy approach
+    // to identify terminals
+    if (propertyUuid(xml_elmt, "uuid", &uuid) == PropertyFlags::Success)
+        d->m_uuid = QUuid(uuid);
+
     if (!d->fromXml(xml_elmt))
         return false;
 
@@ -59,7 +67,18 @@ bool PartTerminal::fromXml(const QDomElement &xml_elmt) {
 	@return un element XML decrivant la borne
 */
 QDomElement PartTerminal::toXml(QDomDocument &xml_document) const {
-    return d->toXml(xml_document);
+
+    QDomElement qdo = xml_document.createElement("terminal");
+
+    qdo.appendChild(createXmlProperty(xml_document, "uuid", d->m_uuid));
+
+    // Do not store terminal data in its own child
+    QDomElement terminalDataElement = d->toXml(xml_document);
+    for (int i=0; i < terminalDataElement.childNodes().length(); i++) {
+        qdo.appendChild(terminalDataElement.childNodes().at(i));
+    }
+
+    return qdo;
 }
 
 bool PartTerminal::valideXml(QDomElement& element) {

sources/properties/terminaldata.cpp

@@ -45,7 +45,6 @@ QDomElement TerminalData::toXml(QDomDocument &xml_document) const
 
     xml_element.appendChild(createXmlProperty(xml_document, "x", q->scenePos().x()));
     xml_element.appendChild(createXmlProperty(xml_document, "y", q->scenePos().y()));
-    xml_element.appendChild(createXmlProperty(xml_document, "uuid", m_uuid));
     xml_element.appendChild(createXmlProperty(xml_document, "name", m_name));
     xml_element.appendChild(createXmlProperty(xml_document, "orientation", orientationToString(m_orientation)));
 
@@ -66,12 +65,8 @@ bool TerminalData::fromXml (const QDomElement &xml_element) // RETURNS True
 
 //    emit posFromXML(QPointF(term_x, term_y));
 
-    QUuid uuid;
+    // do not write uuid from this class, because only PartTerminal::fromXml need
-    // update part and add uuid, which is used in the new version to connect terminals together
+    // to write it to xml file. Terminal::fromXml does not need.
-    // if the attribute not exists, means, the element is created with an older version of qet. So use the legacy approach
-    // to identify terminals
-    if (propertyUuid(xml_element, "uuid", &uuid) == PropertyFlags::Success)
-        m_uuid = QUuid(uuid);
 
 
     //if (propertyString(xml_element, "name", &m_name))