Path: make 3Dview G99 aware

src/Mod/Path/App/PathSegmentWalker.cpp

@@ -327,7 +327,12 @@ void PathSegmentWalker::walk(PathSegmentVisitor &cb, const Base::Vector3d &start
             }
 
             Base::Vector3d p3(next);
-            p3.*pz = last.*pz;
+            if (retract_mode == 99)  // G81,G83 need to account for G99 and retract to R only
+                p3.*pz = p2.*pz;
+            else
+                p3.*pz = last.*pz;
+
+
             Base::Vector3d p3r = compensateRotation(p3, nrot, rotCenter);
 
             plist.push_back(p1r);
@@ -353,6 +358,10 @@ void PathSegmentWalker::walk(PathSegmentVisitor &cb, const Base::Vector3d &start
             pz = &Base::Vector3d::y;
         } else if(name=="G19") {
             pz = &Base::Vector3d::x;
+        } else if(name=="G98") {
+            retract_mode = 98;
+        } else if(name=="G99") {
+            retract_mode = 99;
         }
     }
 }

src/Mod/Path/App/PathSegmentWalker.h

@@ -52,7 +52,7 @@ class PathExport PathSegmentVisitor
 };
 
 /**
- * PathSegmentWalker processes a path a splits all movement commands into straight segments and calls the
+ * PathSegmentWalker processes a path and splits all movement commands into straight segments and calls the
  * appropriate member of the provided PathSegmentVisitor.
  * All non-movement commands are processed accordingly if they affect the movement commands.
  */
@@ -66,6 +66,7 @@ public:
 
 private:
     const Toolpath &tp;
+    int retract_mode;
 };