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/PartSashFactory.java
List<Integer> weightList = sashPart.getWeights();
			
			if (weightList.size() != visCount) {
				weightList.clear();
				for (int i = weightList.size(); i < visCount; i++) {
					weightList.add(new Integer(100));
				}
			}
			
			if (weightList.size() > 0) {
				int count = 0;
				int[] weights = new int[weightList.size()];
				for (Iterator iterator = weightList.iterator(); iterator
						.hasNext();) {
					Integer integer = (Integer) iterator.next();
					weights[count++] = integer;
				}
				sashForm.setWeights(weights);
			}
			
			
			sashPart.eAdapters().add(new AdapterImpl() {
				@Override
				public void notifyChanged(Notification msg) {
					if (ApplicationPackage.Literals.MSASH_FORM__WEIGHTS
							.equals(msg.getFeature())
							&& msg.getNewValue() != null) {
						synchWeightsToModel(sashForm);
					}
				}