Bug 327964 EPartService's hidePart may fail when trying to hide a shared part that's in a shared container
The placeholder retrieval code in the EPartService implementation doesn't go far down deep enough and actually stops at the shared container level. This causes the placeholder of the shared part to not be found.
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
assertEquals(beforeDirty && throwException, saveablePart.isDirty());
		assertEquals(beforeDirty, editor.wasSaveCalled());
	}
	public void testSaveAll_NoHandler_TTT() {
		testSaveAll_NoHandler(true, true, true);
	}
	public void testSaveAll_NoHandler_TTF() {
		testSaveAll_NoHandler(true, true, false);
	}
	public void testSaveAll_NoHandler_TFT() {
		testSaveAll_NoHandler(true, false, true);
	}
	public void testSaveAll_NoHandler_TFF() {
		testSaveAll_NoHandler(true, false, false);
	}
	public void testSaveAll_NoHandler_FTT() {
		testSaveAll_NoHandler(false, true, true);
	}
	public void testSaveAll_NoHandler_FTF() {
		testSaveAll_NoHandler(false, true, false);
	}
	public void testSaveAll_NoHandler_FFT() {
		testSaveAll_NoHandler(false, false, true);
	}
	public void testSaveAll_NoHandler_FFF() {
		testSaveAll_NoHandler(false, false, false);
	}
	private void testSaveAll_NoHandlers(boolean confirm, boolean[] beforeDirty,
			boolean[] afterDirty, boolean success, boolean[] saveCalled,
			boolean[] throwException) {