Fixed saveState() and restoreState() version handling to work like the function from QMainWindow

src/DockManager.cpp

@@ -72,6 +72,16 @@ static void initResource()
 
 namespace ads
 {
+/**
+ * Internal file version in case the sturture changes interbally
+ */
+enum eStateFileVersion
+{
+	InitialVersion = 0,      //!< InitialVersion
+	Version1 = 1,            //!< Version1
+	CurrentVersion = Version1//!< CurrentVersion
+};
+
 static CDockManager::ConfigFlags StaticConfigFlags = CDockManager::DefaultNonOpaqueConfig;
 
 /**
@@ -240,6 +250,13 @@ bool DockManagerPrivate::restoreStateFromXml(const QByteArray &state,  int versi
     	return false;
     }
 
+    ADS_PRINT(s.attributes().value("UserVersion"));
+    v = s.attributes().value("UserVersion").toInt(&ok);
+    if (!ok || v != version)
+    {
+    	return false;
+    }
+
     s.setFileVersion(v);
     bool Result = true;
 #ifdef ADS_DEBUG_PRINT
@@ -528,7 +545,8 @@ QByteArray CDockManager::saveState(int version) const
 	s.setAutoFormatting(ConfigFlags.testFlag(XmlAutoFormattingEnabled));
     s.writeStartDocument();
 		s.writeStartElement("QtAdvancedDockingSystem");
-		s.writeAttribute("Version", QString::number(version));
+		s.writeAttribute("Version", QString::number(CurrentVersion));
+		s.writeAttribute("UserVersion", QString::number(version));
 		s.writeAttribute("Containers", QString::number(d->Containers.count()));
 		for (auto Container : d->Containers)
 		{

src/DockManager.h

@@ -308,8 +308,12 @@ public:
 	 * If auto formatting is enabled, the output is intended and line wrapped.
 	 * The XmlMode XmlAutoFormattingDisabled is better if you would like to have
 	 * a more compact XML output - i.e. for storage in ini files.
+	 * The version number is stored as part of the data.
+	 * To restore the saved state, pass the return value and version number
+	 * to restoreState().
+	 * \see restoreState()
 	 */
-	QByteArray saveState(int version = Version1) const;
+	QByteArray saveState(int version = 0) const;
 
 	/**
 	 * Restores the state of this dockmanagers dockwidgets.
@@ -317,8 +321,9 @@ public:
 	 * not match, the dockmanager's state is left unchanged, and this function
 	 * returns false; otherwise, the state is restored, and this function
 	 * returns true.
+	 * \see saveState()
 	 */
-	bool restoreState(const QByteArray &state, int version = Version1);
+	bool restoreState(const QByteArray &state, int version = 0);
 
 	/**
 	 * Saves the current perspective to the internal list of perspectives.

src/ads_globals.h

@@ -64,13 +64,6 @@ QT_FORWARD_DECLARE_CLASS(QSplitter)
 
 namespace ads
 {
-enum eStateFileVersion
-{
-	InitialVersion = 0,
-	Version1 = 1,
-	CurrentVersion = Version1
-};
-
 class CDockSplitter;
 
 enum DockWidgetArea