[GEF] Harmonize getCommand(Request) in EditPart with upstream class

org.eclipse.wb.core.java/src/org/eclipse/wb/core/gef/policy/selection/TopSelectionEditPolicy.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
@@ -85,7 +85,10 @@ public boolean understandsRequest(Request request) {
 	@Override
 	//@edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "BC_UNCONFIRMED_CAST")
 	public Command getCommand(Request request) {
-		return getResizeCommand((ChangeBoundsRequest) request);
+		if (REQ_RESIZE.equals(request.getType())) {
+			return getResizeCommand((ChangeBoundsRequest) request);
+		}
+		return null;
 	}
 
 	@Override

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

@@ -16,7 +16,6 @@
 
 import org.eclipse.gef.EditPolicy;
 import org.eclipse.gef.Request;
-import org.eclipse.gef.commands.Command;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -223,18 +222,6 @@ private List<EditPolicy> getUnderstandingPolicies(Request request) {
 	// Request/Command
 	//
 	////////////////////////////////////////////////////////////////////////////
-	/**
-	 * Returns the {@link Command} to perform the specified {@link Request} or <code>null</code>.
-	 */
-	public Command getCommand(Request request) {
-		for (EditPolicy editPolicy : getUnderstandingPolicies(request)) {
-			Command command = editPolicy.getCommand(request);
-			if (command != null) {
-				return command;
-			}
-		}
-		return null;
-	}
 
 	/**
 	 * Return the <code>{@link EditPart}</code> that should be used as the <i>target</i> for the

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

@@ -147,20 +147,23 @@ public org.eclipse.wb.gef.core.EditPart getTargetEditPart(Request request) {
 	@Override
 	//@edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "BC_UNCONFIRMED_CAST")
 	public Command getCommand(Request request) {
+		if (!understandsRequest(request)) {
+			return null;
+		}
 		Object type = request.getType();
-		if (type == RequestConstants.REQ_CREATE) {
+		if (REQ_CREATE.equals(type)) {
 			return getCreateCommand((CreateRequest) request);
 		}
-		if (type == PasteRequest.REQ_PASTE) {
+		if (PasteRequest.REQ_PASTE.equals(type)) {
 			return getPasteCommand((PasteRequest) request);
 		}
-		if (type == RequestConstants.REQ_MOVE) {
+		if (REQ_MOVE.equals(type)) {
 			return getMoveCommand((ChangeBoundsRequest) request);
 		}
-		if (type == RequestConstants.REQ_ADD) {
+		if (REQ_ADD.equals(type)) {
 			return getAddCommand((ChangeBoundsRequest) request);
 		}
-		if (type == RequestConstants.REQ_ORPHAN) {
+		if (REQ_ORPHAN.equals(type)) {
 			return getOrphanCommand((GroupRequest) request);
 		}
 		return null;

org.eclipse.wb.core/src-gef/org/eclipse/wb/gef/tree/policies/LayoutEditPolicy.java

@@ -150,6 +150,9 @@ public org.eclipse.wb.gef.core.EditPart getTargetEditPart(Request request) {
 	 */
 	@Override
 	public Command getCommand(Request request) {
+		if (!understandsRequest(request)) {
+			return null;
+		}
 		// prepare drop location
 		DropRequest dropRequest = (DropRequest) request;
 		Point location = dropRequest.getLocation();

org.eclipse.wb.core/src/org/eclipse/wb/core/gef/policy/layout/flow/AbstractFlowLayoutEditPolicy.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
@@ -102,6 +102,9 @@ private List<EditPart> getReferenceChildren(Request request) {
 	////////////////////////////////////////////////////////////////////////////
 	@Override
 	public Command getCommand(Request request) {
+		if (!understandsRequest(request)) {
+			return null;
+		}
 		Command command = super.getCommand(request);
 		if (command == null) {
 			command = getCommand(request, getReferenceObject(request));

org.eclipse.wb.core/src/org/eclipse/wb/core/gef/policy/layout/generic/AbstractColumnSelectionEditPolicy.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
@@ -96,7 +96,10 @@ public boolean understandsRequest(Request request) {
 	@Override
 	//@edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "BC_UNCONFIRMED_CAST")
 	public Command getCommand(Request request) {
-		return getResizeCommand((ChangeBoundsRequest) request);
+		if (REQ_RESIZE.equals(request.getType())) {
+			return getResizeCommand((ChangeBoundsRequest) request);
+		}
+		return null;
 	}
 
 	@Override

org.eclipse.wb.core/src/org/eclipse/wb/core/gef/policy/layout/position/AbstractPositionLayoutEditPolicy.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2024 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
@@ -173,6 +173,9 @@ private static double getOffset(int size, double offsetPercent) {
 	////////////////////////////////////////////////////////////////////////////
 	@Override
 	public Command getCommand(Request request) {
+		if (!understandsRequest(request)) {
+			return null;
+		}
 		if (m_activeFeedback != null) {
 			Command command = getCommand(request, m_activeFeedback.getData());
 			if (command != null) {

org.eclipse.wb.core/src/org/eclipse/wb/core/gefTree/policy/SingleObjectLayoutEditPolicy.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2024 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
@@ -59,6 +59,9 @@ protected final boolean isGoodReferenceChild(Request request, EditPart editPart)
 	////////////////////////////////////////////////////////////////////////////
 	@Override
 	public final Command getCommand(Request request) {
+		if (!understandsRequest(request)) {
+			return null;
+		}
 		if (!isEmpty()) {
 			return null;
 		}

org.eclipse.wb.core/src/org/eclipse/wb/internal/core/gef/policy/layout/generic/SimpleContainerLayoutEditPolicy.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2024 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
@@ -89,6 +89,9 @@ protected void eraseLayoutTargetFeedback(Request request) {
 	////////////////////////////////////////////////////////////////////////////
 	@Override
 	public Command getCommand(Request request) {
+		if (!understandsRequest(request)) {
+			return null;
+		}
 		if (!m_container.isEmpty()) {
 			return null;
 		}

org.eclipse.wb.layout.group/src/org/eclipse/wb/internal/layout/group/gef/GroupSelectionEditPolicy2.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
@@ -275,20 +275,24 @@ private int[] setupResizeEdges(int direction) {
 	@Override
 	public Command getCommand(Request request) {
 		if (REQ_RESIZE.equals(request.getType())) {
-			// resizing multiple components is not supported by Matisse
-			if (((ChangeBoundsRequest) request).getEditParts().size() > 1) {
-				return null;
-			}
-			return new EditCommand(m_layout.getAdapter(JavaInfo.class)) {
-				@Override
-				protected void executeEdit() throws Exception {
-					m_layout.command_commit();
-				}
-			};
+			return getResizeCommand((ChangeBoundsRequest) request);
 		}
 		return null;
 	}
 
+	private Command getResizeCommand(ChangeBoundsRequest request) {
+		// resizing multiple components is not supported by Matisse
+		if (request.getEditParts().size() > 1) {
+			return null;
+		}
+		return new EditCommand(m_layout.getAdapter(JavaInfo.class)) {
+			@Override
+			protected void executeEdit() throws Exception {
+				m_layout.command_commit();
+			}
+		};
+	}
+
 	////////////////////////////////////////////////////////////////////////////
 	//
 	// Alignment figures

org.eclipse.wb.rcp.nebula/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.wb.rcp.nebula;singleton:=true
-Bundle-Version: 1.12.0.qualifier
+Bundle-Version: 1.12.100.qualifier
 Bundle-Activator: org.eclipse.wb.internal.rcp.nebula.Activator
 Bundle-Vendor: %providerName
 Require-Bundle: org.eclipse.ui;bundle-version="[3.206.0,4.0.0)",

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

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2024 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
@@ -86,19 +86,23 @@ protected ILayoutRequestValidator getRequestValidator() {
 	////////////////////////////////////////////////////////////////////////////
 	@Override
 	protected Command getCommand(Request request, Object referenceObject) {
-		if (request instanceof final CollapsibleButtonDropRequest buttonRequest) {
-			final ControlInfo reference = (ControlInfo) referenceObject;
-			return new EditCommand(m_collButtons) {
-				@Override
-				protected void executeEdit() throws Exception {
-					ControlInfo newButton = CollapsibleButtonsInfo.createButton(m_collButtons, reference);
-					buttonRequest.setButton(newButton);
-				}
-			};
+		if (CollapsibleButtonDropRequest.TYPE.equals(request.getType())) {
+			return getDropCommand((CollapsibleButtonDropRequest) request, referenceObject);
 		}
 		return super.getCommand(request, referenceObject);
 	}
 
+	private Command getDropCommand(CollapsibleButtonDropRequest buttonRequest, Object referenceObject) {
+		final ControlInfo reference = (ControlInfo) referenceObject;
+		return new EditCommand(m_collButtons) {
+			@Override
+			protected void executeEdit() throws Exception {
+				ControlInfo newButton = CollapsibleButtonsInfo.createButton(m_collButtons, reference);
+				buttonRequest.setButton(newButton);
+			}
+		};
+	}
+
 	@Override
 	protected Command getMoveCommand(Object moveObject, Object referenceObject) {
 		final ControlInfo button = (ControlInfo) moveObject;

org.eclipse.wb.rcp/src/org/eclipse/wb/internal/rcp/gef/policy/forms/FormHeadLayoutEditPolicy.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2024 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
@@ -78,6 +78,9 @@ protected void eraseLayoutTargetFeedback(Request request) {
 	////////////////////////////////////////////////////////////////////////////
 	@Override
 	public Command getCommand(Request request) {
+		if (!understandsRequest(request)) {
+			return null;
+		}
 		if (m_form.getHeadClient() != null) {
 			return null;
 		}

org.eclipse.wb.rcp/src/org/eclipse/wb/internal/rcp/gef/policy/forms/layout/ColumnLayoutSelectionEditPolicy.java

@@ -95,7 +95,10 @@ public boolean understandsRequest(Request request) {
 
 	@Override
 	public Command getCommand(final Request request) {
-		return getResizeCommand((ChangeBoundsRequest) request);
+		if (REQ_RESIZE.equals(request.getType())) {
+			return getResizeCommand((ChangeBoundsRequest) request);
+		}
+		return null;
 	}
 
 	@Override

org.eclipse.wb.rcp/src/org/eclipse/wb/internal/rcp/gef/policy/jface/DialogButtonBarLayoutEditPolicy.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2024 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
@@ -89,19 +89,23 @@ protected ILayoutRequestValidator getRequestValidator() {
 	////////////////////////////////////////////////////////////////////////////
 	@Override
 	protected Command getCommand(Request request, Object referenceObject) {
-		if (request instanceof final DialogButtonDropRequest buttonRequest) {
-			final ControlInfo reference = (ControlInfo) referenceObject;
-			return new EditCommand(m_composite) {
-				@Override
-				protected void executeEdit() throws Exception {
-					ControlInfo newButton = DialogInfo.createButtonOnButtonBar(m_composite, reference);
-					buttonRequest.setButton(newButton);
-				}
-			};
+		if (DialogButtonDropRequest.TYPE.equals(request.getType())) {
+			return getDropCommand((DialogButtonDropRequest) request, referenceObject);
 		}
 		return super.getCommand(request, referenceObject);
 	}
 
+	private Command getDropCommand(DialogButtonDropRequest buttonRequest, Object referenceObject) {
+		final ControlInfo reference = (ControlInfo) referenceObject;
+		return new EditCommand(m_composite) {
+			@Override
+			protected void executeEdit() throws Exception {
+				ControlInfo newButton = DialogInfo.createButtonOnButtonBar(m_composite, reference);
+				buttonRequest.setButton(newButton);
+			}
+		};
+	}
+
 	@Override
 	protected Command getMoveCommand(Object moveObject, Object referenceObject) {
 		final ControlInfo button = (ControlInfo) moveObject;

org.eclipse.wb.rcp/src/org/eclipse/wb/internal/rcp/gef/policy/jface/action/ToolBarManagerLayoutEditPolicy.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2024 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
@@ -86,20 +86,24 @@ protected ILayoutRequestValidator getRequestValidator() {
 	////////////////////////////////////////////////////////////////////////////
 	@Override
 	protected Command getCommand(Request request, Object referenceObject) {
-		if (request instanceof final ActionDropRequest actionRequest) {
-			final ContributionItemInfo reference = (ContributionItemInfo) referenceObject;
-			return new EditCommand(m_manager) {
-				@Override
-				protected void executeEdit() throws Exception {
-					ActionContributionItemInfo newItem =
-							m_manager.command_CREATE(actionRequest.getAction(), reference);
-					actionRequest.setItem(newItem);
-				}
-			};
+		if (ActionDropRequest.TYPE.equals(request.getType())) {
+			return getDropCommand((ActionDropRequest) request, referenceObject);
 		}
 		return super.getCommand(request, referenceObject);
 	}
 
+	private Command getDropCommand(ActionDropRequest actionRequest, Object referenceObject) {
+		final ContributionItemInfo reference = (ContributionItemInfo) referenceObject;
+		return new EditCommand(m_manager) {
+			@Override
+			protected void executeEdit() throws Exception {
+				ActionContributionItemInfo newItem =
+						m_manager.command_CREATE(actionRequest.getAction(), reference);
+				actionRequest.setItem(newItem);
+			}
+		};
+	}
+
 	@Override
 	protected void command_CREATE(ContributionItemInfo newObject, ContributionItemInfo referenceObject)
 			throws Exception {

org.eclipse.wb.rcp/src/org/eclipse/wb/internal/rcp/gef/policy/rcp/perspective/AbstractPartSelectionEditPolicy.java

@@ -115,7 +115,10 @@ public boolean understandsRequest(Request request) {
 
 	@Override
 	public Command getCommand(final Request request) {
-		return getResizeCommand((ChangeBoundsRequest) request);
+		if (REQ_RESIZE.equals(request.getType())) {
+			return getResizeCommand((ChangeBoundsRequest) request);
+		}
+		return null;
 	}
 
 	@Override