Use only single call of EcoreUtil.Copier.copyReferences()

- Do not call for each EObject that is EcoreUtil.Copier.copy()ed
- But only once per copy-and-paste operation

Issue-Ref: 2845
Signed-off-by: Simon Barner <barner@fortiss.org>

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/util/.ratings

 ActionUtils.java 4553e487264e3d1f86f4767da4a7400cce4b9a5d GREEN
 ConstraintsUIUtils.java 69d5e08bbf768baf2790380e36f1020ef826a33e GREEN
-CopyPasteUtils.java 445f585fe70e79f63c47f278d27cac48253571a8 YELLOW
+CopyPasteUtils.java 66ff2c44bef3bfecc85a6d3109c6b15a8960fa38 YELLOW
 DataBindingUtils.java 0818014c193a22d5968435e78590368b95138d5e GREEN
 DragAndDropUtils.java 7aab91518aa12d76533a345bf6ed0be9ac7ff0e5 GREEN
 EObjectSelectionUtils.java 928280b5dd3bb634debc1ac3be9f15b4e45f2683 GREEN

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/util/CopyPasteUtils.java

@@ -74,9 +74,9 @@ public class CopyPasteUtils {
 						((IConstrained)subObj).getConstraintInstances().clear();
 					}
 				}
-				copier.copyReferences();
 				i++;
 			}
+			copier.copyReferences();
 			EList<ISpeciallyCopyiable> specialSel =
 					pickInstanceOf(ISpeciallyCopyiable.class, new BasicEList<EObject>(sel));
 			for(ISpeciallyCopyiable obj : specialSel) {
@@ -132,11 +132,12 @@ public class CopyPasteUtils {
 		for(EObject obj : getClipBoardContent()) {
 			EObject copy = copier.copy(obj);
 			adaptCopyNames(copy, target);
-			copier.copyReferences();
 			IElementCompositorService.getInstance().compose(target, copy,
 					new PasteContext(getEditedEObject(), copier));
 			copiedObjects.add(copy);
 		}
+		copier.copyReferences();
+
 		for(EObject obj : getClipBoardContent()) {
 			if(obj instanceof ISpeciallyCopyiable) {
 				((ISpeciallyCopyiable)obj).specialCopyHook(copier);