Add button to expand all extension points

Author: nburnwal09

ui/org.eclipse.pde.ui/icons/elcl16/expandall.svg

@@ -238,6 +238,7 @@ public class PDEPluginImages {
 	public static final ImageDescriptor DESC_HORIZONTAL = create(PATH_LCL, "th_horizontal.svg"); //$NON-NLS-1$
 	public static final ImageDescriptor DESC_VERTICAL = create(PATH_LCL, "th_vertical.svg"); //$NON-NLS-1$
 	public static final ImageDescriptor DESC_COLLAPSE_ALL = create(PATH_LCL, "collapseall.svg"); //$NON-NLS-1$
+	public static final ImageDescriptor DESC_EXPAND_ALL = create(PATH_LCL, "expandall.svg"); //$NON-NLS-1$
 	public static final ImageDescriptor DESC_COLLAPSE_ALL_MINI = create(PATH_LCL, "collapse_all_mini.svg"); //$NON-NLS-1$
 	public static final ImageDescriptor DESC_TOGGLE_EXPAND_STATE = create(PATH_LCL, "toggle_expand_state.svg"); //$NON-NLS-1$
 	public static final ImageDescriptor DESC_HELP = create(PATH_LCL, "help.svg"); //$NON-NLS-1$

ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/PDEPluginImages.java

@@ -1398,6 +1398,7 @@ public class PDEUIMessages extends NLS {
 	public static String JavaAttributeWizard_wtitle;
 
 	public static String ExtensionsPage_collapseAll;
+	public static String ExtensionsPage_expandAll;
 	public static String ExtensionPointDetails_title;
 	public static String ExtensionPointDetails_desc;
 	public static String ExtensionPointDetails_id;

ui/org.eclipse.pde.ui/src/org/eclipse/pde/internal/ui/PDEUIMessages.java

@@ -0,0 +1,44 @@
+/*******************************************************************************
+ *  Copyright (c) 2026 IBM Corporation and others.
+ *
+ *  This program and the accompanying materials
+ *  are made available under the terms of the Eclipse Public License 2.0
+ *  which accompanies this distribution, and is available at
+ *  https://www.eclipse.org/legal/epl-2.0/
+ *
+ *  SPDX-License-Identifier: EPL-2.0
+ *
+ *  Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.pde.internal.ui.editor.actions;
+
+import org.eclipse.jface.action.Action;
+import org.eclipse.jface.action.IAction;
+import org.eclipse.jface.viewers.AbstractTreeViewer;
+import org.eclipse.pde.internal.ui.PDEPluginImages;
+
+public class ExpandAllAction extends Action {
+	private AbstractTreeViewer fTreeViewer;
+
+	public ExpandAllAction(AbstractTreeViewer viewer, String tooltipText) {
+		super(tooltipText, IAction.AS_PUSH_BUTTON);
+		initialize(viewer, tooltipText);
+	}
+
+	private void initialize(AbstractTreeViewer viewer, String tooltipText) {
+		setToolTipText(tooltipText);
+		setImageDescriptor(PDEPluginImages.DESC_EXPAND_ALL);
+		fTreeViewer = viewer;
+	}
+
+	@Override
+	public void run() {
+
+		if (fTreeViewer == null) {
+			return;
+		}
+		fTreeViewer.expandAll();
+	}
+
+}