Sketcher: Extension of constraints to store virtual space affiliation

=====================================================================

The constraint class has been extended so that every constraint knows and serializes whether it is in virtual space or in normal real space.

src/Mod/Sketcher/App/Constraint.cpp

@@ -58,7 +58,8 @@ Constraint::Constraint()
   LabelDistance(10.f),
   LabelPosition(0.f),
   isDriving(true),
-  InternalAlignmentIndex(-1)
+  InternalAlignmentIndex(-1),
+  isInVirtualSpace(false)
 {
     // Initialize a random number generator, to avoid Valgrind false positives.
     static boost::mt19937 ran;
@@ -88,6 +89,7 @@ Constraint::Constraint(const Constraint& from)
   LabelPosition(from.LabelPosition),
   isDriving(from.isDriving),
   InternalAlignmentIndex(from.InternalAlignmentIndex),
+  isInVirtualSpace(from.isInVirtualSpace),
   tag(from.tag)
 {
 }
@@ -118,6 +120,7 @@ Constraint *Constraint::copy(void) const
     temp->LabelPosition = this->LabelPosition;
     temp->isDriving = this->isDriving;
     temp->InternalAlignmentIndex = this->InternalAlignmentIndex;
+    temp->isInVirtualSpace = this->isInVirtualSpace;
     // Do not copy tag, otherwise it is considered a clone, and a "rename" by the expression engine.
     return temp;
 }
@@ -183,8 +186,9 @@ void Constraint::Save (Writer &writer) const
     << "ThirdPos=\""                    <<  (int) ThirdPos          << "\" "
     << "LabelDistance=\""               <<  LabelDistance           << "\" "
     << "LabelPosition=\""               <<  LabelPosition           << "\" "
-    << "IsDriving=\""                   <<  (int)isDriving          << "\" />"
-
+    << "IsDriving=\""                   <<  (int)isDriving          << "\" "
+    << "IsInVirtualSpace=\""            <<  (int)isInVirtualSpace          << "\" />"
+    
     << std::endl;
 }
 
@@ -224,4 +228,7 @@ void Constraint::Restore(XMLReader &reader)
 
     if (reader.hasAttribute("IsDriving"))
         isDriving = reader.getAttributeAsInteger("IsDriving") ? true : false;
+
+    if (reader.hasAttribute("IsInVirtualSpace"))
+        isInVirtualSpace = reader.getAttributeAsInteger("IsInVirtualSpace") ? true : false;
 }

src/Mod/Sketcher/App/Constraint.h

@@ -122,6 +122,7 @@ public:
     float LabelPosition;
     bool isDriving;
     int InternalAlignmentIndex; // Note: for InternalAlignment Type this index indexes equal internal geometry elements (e.g. index of pole in a bspline). It is not a GeoId!! 
+    bool isInVirtualSpace;
 
 protected:
     boost::uuids::uuid tag;