Bug 282890 [UI][CSS] Parts not always getting styled
I noticed a case where the perspective tab was getting styled but the other tabs weren't. There may be sequencing problems where we call too early to style the UI, then parts are added unstyled. This was in the legacy app. In order to ensure the styling engine is run, we should call the styling engine on SWTPartFactory.bindWidget().
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/SWTPartFactory.java
private static Shell limbo;
	public Object createMenu(MPart<?> part, Object widgetObject, MMenu menu) {
		Widget widget = (Widget) widgetObject;
		Menu swtMenu;
		MenuManager manager = new MenuManager();
		if (widget instanceof Decorations) {
			swtMenu = manager.createMenuBar((Decorations) widgetObject);
			((Decorations) widget).setMenuBar(swtMenu);
		} else if (widget instanceof Control) {
			swtMenu = manager.createContextMenu((Control) widget);
			
		} else {
			throw new IllegalArgumentException(
					"The widget must be MenuItem, Decorations, or Control but is: " 
							+ widgetObject);
		}
		swtMenu.setData(PartFactory.OWNING_ME, menu);
		for (MMenuItem menuItem : menu.getItems()) {
			createMenuItem(part, manager, menuItem);
		}
		manager.update(true);
		return swtMenu;
	}