TEIIDDES-1724: Stops active editor selection if object is a descendent

* When opening an editor, the default behaviour is to find the file that
  is the input of the editor. This file is then selected in the model
  explorer if 'link with editor' is enabled.

* Behaviour changed to check whether the file being selected in the model
  explorer is the container of the currently selected object. If it is
  then do not change the selection.

plugins/org.teiid.designer.ui/src/org/teiid/designer/ui/explorer/ModelExplorerResourceNavigator.java

@@ -14,6 +14,7 @@
 import java.util.List;
 import java.util.Set;
 import org.eclipse.core.commands.operations.IUndoContext;
+import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IMarker;
 import org.eclipse.core.resources.IMarkerDelta;
 import org.eclipse.core.resources.IProject;
@@ -70,6 +71,7 @@
 import org.eclipse.swt.widgets.Menu;
 import org.eclipse.ui.IActionBars;
 import org.eclipse.ui.IActionDelegate;
+import org.eclipse.ui.IEditorPart;
 import org.eclipse.ui.IMemento;
 import org.eclipse.ui.IPartListener;
 import org.eclipse.ui.ISelectionListener;
@@ -92,6 +94,7 @@
 import org.eclipse.ui.forms.widgets.Section;
 import org.eclipse.ui.handlers.IHandlerService;
 import org.eclipse.ui.ide.IGotoMarker;
+import org.eclipse.ui.ide.ResourceUtil;
 import org.eclipse.ui.operations.UndoActionHandler;
 import org.eclipse.ui.part.IShowInTarget;
 import org.eclipse.ui.part.PluginTransfer;
@@ -1621,6 +1624,41 @@ else if (renameAction != null && renameAction.isEnabled()) {
         }
     }
 
+    @Override
+    protected void editorActivated(IEditorPart editor) {
+        if (!isLinkingEnabled()) {
+            return;
+        }
+
+        IFile file = ResourceUtil.getFile(editor.getEditorInput());
+        if (file == null)
+            return;
+
+        ISelection newSelection = new StructuredSelection(file);
+        TreeViewer treeViewer = getTreeViewer();
+        ISelection oldSelection = treeViewer.getSelection();
+
+        if (oldSelection.equals(newSelection)) {
+            treeViewer.getTree().showSelection();
+            return;
+        }
+
+        if (oldSelection instanceof IStructuredSelection && !oldSelection.isEmpty()) {
+            IStructuredSelection sSelection = (IStructuredSelection) oldSelection;
+            /*
+             * If the current selection is in any way a sub-compoment of the new selected file,
+             * eg. a table or transformation diagram, then don't select the file as this is just
+             * an annoying waste of time.
+             */
+            for (Object element : sSelection.toArray()) {
+                if (file.equals(ResourceUtil.getFile(element)))
+                    return;
+            }
+        }
+
+        treeViewer.setSelection(newSelection, true);
+    }
+
     protected class ShowImportsAction extends Action {
         public ShowImportsAction() {
             super(Util.getString(I18N_PREFIX + "showImportsAction"), IAction.AS_CHECK_BOX); //$NON-NLS-1$