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
manager.add(new HandledContributionItem(toolBarItem, context));
	}
	private void createMenuItem(MPart<?> part, final MenuManager manager,
			final MHandledItem handledItem) {
		if (handledItem instanceof MMenuItemRenderer) {
			final IContributionItem renderer = (IContributionItem) ((MMenuItemRenderer) handledItem)
					.getRenderer();
			manager.add(renderer);
			return;
		}
		if (handledItem instanceof MMenuItem) {
			final MMenuItem mItem = (MMenuItem) handledItem;
			final String id = mItem.getId();
			if (mItem.isSeparator()) {
				if (!mItem.isVisible()) {
					if (id != null) {
						manager.add(new GroupMarker(id));
					}
				} else {
					if (id == null) {
						manager.add(new Separator());
					} else {
						manager.add(new Separator(id));
					}
				}
				return;
			} else if (mItem.getMenu() != null) {
				MenuManager item = new MenuManager(mItem.getName(), id);
				manager.add(item);
				for (MMenuItem menuItem : mItem.getMenu().getItems()) {