Bug 343003 Selection changes for shared parts may not be propagated if they were not originally rendered in the model
The search algorithm currently only iterates through containers for parts. This will not work for parts that are represented by placeholders.
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/ESelectionServiceTest.java
assertNull(partTwoImpl.input);
		assertEquals(selection2, partThreeImpl.input);
		
		
		partContextC.runAndTrack(new RunAndTrack() {
			public boolean changed(IEclipseContext context) {
				ESelectionService s = (ESelectionService) partContextA
						.get(ESelectionService.class.getName());
				partOneImpl.setOtherSelection(s.getSelection("partC"));
				return true;
			}
		});
		assertEquals(selection, partOneImpl.input);
		assertEquals(selection2, partOneImpl.otherSelection);
		assertNull(partTwoImpl.input);
		assertEquals(selection2, partThreeImpl.input);
		partThreeImpl.setSelection(selection);
		assertEquals(selection, partOneImpl.input);
		assertEquals(selection, partOneImpl.otherSelection);
		assertNull(partTwoImpl.input);
		assertEquals(selection, partThreeImpl.input);
		partThreeImpl.setSelection(null);
		assertEquals(selection, partOneImpl.input);
		assertNull(partOneImpl.otherSelection);
		assertNull(partTwoImpl.input);
		assertNull(partThreeImpl.input);
	}
	public void testPartOneTracksPartThree2() throws Exception {
		MApplication application = ApplicationFactoryImpl.eINSTANCE
				.createApplication();