Disposing and recreating menus menus when parent changes

Menus, unlike controls, were not reparented when their associated part
was moved (e.g., dragged to a different monitor). This caused menu icons
and images to render at the wrong zoom due to the old parent's DPI.

This change checks if a menu's parent has changed during rendering.
If so, the menu is disposed and recreated under the correct parent,
ensuring proper scaling and visual consistency across monitors.

Author: arunjose696

bundles/org.eclipse.e4.ui.workbench.swt/src/org/eclipse/e4/ui/internal/workbench/swt/PartRenderingEngine.java

@@ -99,8 +99,10 @@
 import org.eclipse.swt.events.ShellEvent;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.Decorations;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Listener;
+import org.eclipse.swt.widgets.Menu;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.Widget;
 import org.eclipse.ui.testing.TestableObject;
@@ -583,6 +585,17 @@ public Object safeCreateGui(MUIElement element, Object parentWidget,
 				}
 			}
 
+			if (currentWidget instanceof Menu menu) {
+				if (parentWidget instanceof Decorations) {
+					Decorations currentParent = menu.getParent();
+					if (currentParent != parentWidget) {
+						menu.dispose();
+						return safeCreateGui(element, parentWidget, parentContext);
+					}
+				}
+
+			}
+
 			// Reparent the context (or the kid's context)
 			if (element instanceof MContext) {
 				IEclipseContext ctxt = ((MContext) element).getContext();