redo relaxed validation

diylc/diylc-core/src/org/diylc/presenter/Presenter.java

@@ -1258,15 +1258,15 @@ public class Presenter implements IPlugInPort {
         }
       }
 
-//      for (int i = 0; i < controlPoints.length - 1; i++) {
-//        for (int j = i + 1; j < controlPoints.length; j++) {
-//          if (controlPoints[i] != null && controlPoints[j] != null && controlPoints[i].equals(controlPoints[j])) {
-//            // Control points collision detected, cannot make
-//            // this move.
-//            return null;
-//          }
-//        }
-//      }
+      for (int i = 0; i < controlPoints.length - 1; i++) {
+        for (int j = i + 1; j < controlPoints.length; j++) {
+          if (controlPoints[i] != null && controlPoints[j] != null && controlPoints[i].equals(controlPoints[j])) {
+            // Control points collision detected, cannot make
+            // this move.
+            return null;
+          }
+        }
+      }
     }
 
     // Update all points to new location.

diylc/diylc-library/src/org/diylc/components/Abstract3LegSymbol.java

@@ -263,6 +263,11 @@ public abstract class Abstract3LegSymbol extends AbstractComponent<String> {
   @Override
   public boolean canPointMoveFreely(int pointIndex) {   
     return pointIndex == 3;
+  }
+  
+  @Override
+  public boolean canControlPointOverlap(int index) {
+    return index >= 3;
   }
 
   @EditableProperty

diylc/diylc-library/src/org/diylc/components/AbstractLeadedComponent.java

@@ -536,6 +536,11 @@ public abstract class AbstractLeadedComponent<T> extends AbstractTransparentComp
   public VisibilityPolicy getControlPointVisibilityPolicy(int index) {
     return getMoveLabel() || index < 2 ? VisibilityPolicy.ALWAYS : VisibilityPolicy.NEVER;
   }
+  
+  @Override
+  public boolean canControlPointOverlap(int index) {
+    return index >= 2;
+  }
 
   @Override
   public void setControlPoint(Point point, int index) {