fixes #1810 broken toolbar actions on nodes in the function graph

Ghidra/Framework/Docking/src/main/java/docking/menu/ToolBarItemManager.java

@@ -113,7 +113,7 @@ public class ToolBarItemManager implements PropertyChangeListener, ActionListene
 	@Override
 	public void actionPerformed(ActionEvent event) {
 		DockingWindowManager.clearMouseOverHelp();
-		ActionContext context = windowManager.getActionContext(toolBarAction);
+		ActionContext context = getActionContext();
 
 		context.setSourceObject(event.getSource());
 
@@ -130,6 +130,18 @@ public class ToolBarItemManager implements PropertyChangeListener, ActionListene
 		});
 	}
 
+	private ActionContext getActionContext() {
+		if (windowManager != null) {
+			return windowManager.getActionContext(toolBarAction);
+		}
+
+		ComponentProvider provider = getComponentProvider();
+		ActionContext context = provider == null ? null : provider.getActionContext(null);
+		final ActionContext actionContext =
+			context == null ? new ActionContext(provider, null) : context;
+		return actionContext;
+	}
+
 	@Override
 	public String toString() {
 		return toolBarAction.getName();