Fixed start drag distance to be based on QApplication::startDragDistance, fixed dragging of dock widget title bar to support dragging in x and y direction

src/DockManager.cpp

@@ -44,6 +44,7 @@
 #include <QXmlStreamReader>
 #include <QSettings>
 #include <QMenu>
+#include <QApplication>
 
 #include "FloatingDockContainer.h"
 #include "DockOverlay.h"
@@ -629,6 +630,13 @@ bool CDockManager::isRestoringState() const
 	return d->RestoringState;
 }
 
+
+//===========================================================================
+int CDockManager::startDragDistance()
+{
+	return QApplication::startDragDistance() * 1.5;
+}
+
 } // namespace ads
 
 //---------------------------------------------------------------------------