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
testSavePart(ISaveHandler.Save.YES, false, false, true);
	}
	public void testSavePart_YesFalseFalseFalse() {
		testSavePart(ISaveHandler.Save.YES, false, false, false);
	}
	public void testSavePart_NoTrueTrueTrue() {
		testSavePart(ISaveHandler.Save.NO, true, true, true);
	}
	public void testSavePart_NoTrueTrueFalse() {
		testSavePart(ISaveHandler.Save.NO, true, true, false);
	}
	public void testSavePart_NoTrueFalseTrue() {
		testSavePart(ISaveHandler.Save.NO, true, false, true);
	}
	public void testSavePart_NoTrueFalseFalse() {
		testSavePart(ISaveHandler.Save.NO, true, false, false);
	}
	public void testSavePart_NoFalseTrueTrue() {
		testSavePart(ISaveHandler.Save.NO, false, true, true);
	}
	public void testSavePart_NoFalseTrueFalse() {
		testSavePart(ISaveHandler.Save.NO, false, true, false);
	}
	public void testSavePart_NoFalseFalseTrue() {
		testSavePart(ISaveHandler.Save.NO, false, false, true);
	}
	public void testSavePart_NoFalseFalseFalse() {
		testSavePart(ISaveHandler.Save.NO, false, false, false);
	}
	public void testSavePart_CancelTrueTrueTrue() {