Bug 282875 [UI] Allow parts of models to be rendered
We need to change the rendering protocol to allow a 'createGui' to specify the container it should be created under (in SWT-land this would be a Composite). This is necessary to facilitate unit tests and to allow the ad-hoc rendering of chunks of a model within an arbitrary container (i.e. a Dialog or Wizard). In order to do this we'll have to make an API change to the PartFactory's 'createWidget' so that it will get the parent container as a parameter. In order to 'upgrade' an existing PartFactory you would simply replace the code you're currently using to find the correct container with the new parameter's value.
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/workbench/ui/renderers/swt/StackModelFactory.java
EList<MPart> kids = element.getParent().getChildren();
		for (Iterator iterator = kids.iterator(); iterator.hasNext();) {
			MPart mPart = (MPart) iterator.next();
			if (mPart == element)
				return index;
			if (mPart.isVisible())
				index++;
		}
		return index;
	}
	@Override
	public void childAdded(final MPart<?> parentElement, MPart<?> element) {
		super.childAdded(parentElement, element);
		if (element instanceof MItemPart<?>) {
			internalChildAdded(parentElement, element);
			
			
			Control ctrl = (Control) element.getWidget();
			if (ctrl != null) {
				showTab((MItemPart<?>) element);
				stylingEngine.style(ctrl);
			}
		}
	}
	private CTabItem findItemForPart(MPart<?> folder, MPart<?> part) {
		CTabFolder ctf = (CTabFolder) folder.getWidget();
		if (ctf == null)
			return null;
		CTabItem[] items = ctf.getItems();
		for (int i = 0; i < items.length; i++) {