[GEF] Use GEF EditPart interface everywhere else

In continuation of 28f2926, which now
updates all imports of the WindowBuilder edit-part with an import of the
GEF edit-part, with only a handful of references remaining that can't
yet be adapted, as they would require an explicit type-cast.

Author: ptziegler

org.eclipse.wb.core.java/src/org/eclipse/wb/core/gef/policy/DirectTextPropertyEditPolicy.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2025 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -15,7 +15,6 @@
 import org.eclipse.wb.core.gef.part.AbstractComponentEditPart;
 import org.eclipse.wb.core.model.AbstractComponentInfo;
 import org.eclipse.wb.core.model.JavaInfo;
-import org.eclipse.wb.gef.core.EditPart;
 import org.eclipse.wb.gef.core.requests.KeyRequest;
 import org.eclipse.wb.gef.graphical.policies.DirectTextEditPolicy;
 import org.eclipse.wb.internal.core.model.JavaInfoUtils;
@@ -31,6 +30,7 @@
 import org.eclipse.draw2d.geometry.Dimension;
 import org.eclipse.draw2d.geometry.Point;
 import org.eclipse.draw2d.geometry.Rectangle;
+import org.eclipse.gef.EditPart;
 import org.eclipse.gef.EditPolicy;
 import org.eclipse.gef.Request;
 import org.eclipse.jface.preference.IPreferenceStore;
@@ -101,7 +101,7 @@ private static void installEx(EditPart editPart, AbstractComponentInfo component
 				Property property = PropertyUtils.getByPath(component, propertyPath);
 				if (property != null) {
 					EditPolicy policy = new DirectTextPropertyEditPolicy(component, property);
-					editPart.installEditPolicy(policy);
+					editPart.installEditPolicy(policy.getClass(), policy);
 					return;
 				}
 			}

org.eclipse.wb.core.java/src/org/eclipse/wb/internal/core/gef/part/AbstractWrapperEditPart.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2025 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -16,14 +16,14 @@
 import org.eclipse.wb.core.model.IWrapper;
 import org.eclipse.wb.core.model.IWrapperInfo;
 import org.eclipse.wb.draw2d.Figure;
-import org.eclipse.wb.gef.core.EditPart;
 import org.eclipse.wb.gef.graphical.GraphicalEditPart;
 
 import org.eclipse.draw2d.ColorConstants;
 import org.eclipse.draw2d.Graphics;
 import org.eclipse.draw2d.IFigure;
 import org.eclipse.draw2d.geometry.Point;
 import org.eclipse.draw2d.geometry.Rectangle;
+import org.eclipse.gef.EditPart;
 import org.eclipse.gef.EditPolicy;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.swt.graphics.Image;

org.eclipse.wb.core.java/src/org/eclipse/wb/internal/core/gef/part/nonvisual/ArrayObjectEditPart.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2025 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -14,11 +14,11 @@
 
 import org.eclipse.wb.core.gef.policy.selection.NonResizableSelectionEditPolicy;
 import org.eclipse.wb.draw2d.Figure;
-import org.eclipse.wb.gef.core.EditPart;
 import org.eclipse.wb.gef.graphical.GraphicalEditPart;
 import org.eclipse.wb.internal.core.model.nonvisual.AbstractArrayObjectInfo;
 
 import org.eclipse.draw2d.IFigure;
+import org.eclipse.gef.EditPart;
 import org.eclipse.gef.EditPolicy;
 /**
  * {@link EditPart} for <i>array objects</i> model.

org.eclipse.wb.core.java/src/org/eclipse/wb/internal/core/gef/part/nonvisual/NonVisualBeanEditPart.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2025 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -15,12 +15,12 @@
 import org.eclipse.wb.core.gef.policy.selection.NonResizableSelectionEditPolicy;
 import org.eclipse.wb.core.model.JavaInfo;
 import org.eclipse.wb.core.model.ObjectInfo;
-import org.eclipse.wb.gef.core.EditPart;
 import org.eclipse.wb.gef.graphical.GraphicalEditPart;
 import org.eclipse.wb.internal.core.model.nonvisual.NonVisualBeanInfo;
 
 import org.eclipse.draw2d.IFigure;
-import org.eclipse.gef.EditPolicy;
+import org.eclipse.gef.EditPart;
+import org.eclipse.gef.EditPolicy;
 import org.eclipse.jface.resource.ImageDescriptor;
 
 /**

org.eclipse.wb.core.java/src/org/eclipse/wb/internal/core/gef/policy/OpenListenerEditPolicy.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2023 Google, Inc.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -13,13 +13,13 @@
 package org.eclipse.wb.internal.core.gef.policy;
 
 import org.eclipse.wb.core.model.JavaInfo;
-import org.eclipse.wb.gef.core.EditPart;
 import org.eclipse.wb.gef.core.policies.EditPolicy;
 import org.eclipse.wb.internal.core.model.JavaInfoUtils;
 import org.eclipse.wb.internal.core.model.property.event.EventsProperty;
 import org.eclipse.wb.internal.core.utils.execution.ExecutionUtils;
 import org.eclipse.wb.internal.core.utils.execution.RunnableEx;
 
+import org.eclipse.gef.EditPart;
 import org.eclipse.gef.Request;
 import org.eclipse.gef.RequestConstants;
 

org.eclipse.wb.core/src-gef/org/eclipse/wb/gef/core/RequestProcessor.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2025 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -14,6 +14,7 @@
 
 import org.eclipse.wb.gef.core.tools.Tool;
 
+import org.eclipse.gef.EditPart;
 import org.eclipse.gef.EditPolicy;
 import org.eclipse.gef.Request;
 

org.eclipse.wb.core/src-gef/org/eclipse/wb/gef/core/tools/DragEditPartTracker.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2025 Google, Inc. and others.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -49,7 +49,7 @@ public class DragEditPartTracker extends SelectEditPartTracker {
 	// Constructor
 	//
 	////////////////////////////////////////////////////////////////////////////
-	public DragEditPartTracker(org.eclipse.wb.gef.core.EditPart sourceEditPart) {
+	public DragEditPartTracker(EditPart sourceEditPart) {
 		super(sourceEditPart);
 		setDefaultCursor(SharedCursors.CURSOR_MOVE);
 		setDisabledCursor(SharedCursors.CURSOR_NO);

org.eclipse.wb.core/src-gef/org/eclipse/wb/gef/graphical/policies/SelectionEditPolicy.java

@@ -14,10 +14,10 @@
 
 import org.eclipse.wb.draw2d.FigureUtils;
 import org.eclipse.wb.draw2d.Layer;
-import org.eclipse.wb.gef.core.EditPart;
 import org.eclipse.wb.gef.core.IEditPartViewer;
 import org.eclipse.wb.gef.graphical.handles.Handle;
 
+import org.eclipse.gef.EditPart;
 import org.eclipse.gef.EditPartListener;
 import org.eclipse.gef.EditPolicy;
 import org.eclipse.gef.LayerConstants;

org.eclipse.wb.rcp.nebula/src/org/eclipse/wb/internal/rcp/nebula/collapsiblebuttons/CollapsibleButtonDropTool.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2023 Google, Inc.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -12,11 +12,11 @@
  *******************************************************************************/
 package org.eclipse.wb.internal.rcp.nebula.collapsiblebuttons;
 
-import org.eclipse.wb.gef.core.EditPart;
 import org.eclipse.wb.gef.core.tools.AbstractCreationTool;
 import org.eclipse.wb.gef.core.tools.Tool;
 import org.eclipse.wb.internal.swt.model.widgets.ControlInfo;
 
+import org.eclipse.gef.EditPart;
 import org.eclipse.gef.EditPartViewer;
 import org.eclipse.gef.Request;
 
@@ -43,7 +43,7 @@ protected void selectAddedObjects() {
 		ControlInfo button = request.getButton();
 		if (button != null) {
 			EditPartViewer viewer = getCurrentViewer();
-			EditPart editPart = (EditPart) viewer.getEditPartRegistry().get(button);
+			EditPart editPart = viewer.getEditPartRegistry().get(button);
 			if (editPart != null) {
 				viewer.select(editPart);
 			}

org.eclipse.wb.rcp.nebula/src/org/eclipse/wb/internal/rcp/nebula/collapsiblebuttons/CollapsibleButtonsEditPart.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011 Google, Inc.
+ * Copyright (c) 2011, 2026 Google, Inc. and others.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
@@ -12,10 +12,11 @@
  *******************************************************************************/
 package org.eclipse.wb.internal.rcp.nebula.collapsiblebuttons;
 
-import org.eclipse.wb.gef.core.EditPart;
 import org.eclipse.wb.gef.graphical.policies.TerminatorLayoutEditPolicy;
 import org.eclipse.wb.internal.swt.gef.part.CompositeEditPart;
 
+import org.eclipse.gef.EditPart;
+
 /**
  * {@link EditPart} for {@link CollapsibleButtonsInfo}.
  *