Bug 321755 EPS adds a part without considering its placeholder if no target container or part stacks could be found
The summary probably makes no sense. Will deliver a fix with a test in a bit.
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
public void testSavePart_YesTrueTrueTrue() {
		testSavePart(ISaveHandler.Save.YES, true, true, true);
	}
	public void testSavePart_YesTrueTrueFalse() {
		testSavePart(ISaveHandler.Save.YES, true, true, false);
	}
	public void testSavePart_YesTrueFalseTrue() {
		testSavePart(ISaveHandler.Save.YES, true, false, true);
	}
	public void testSavePart_YesTrueFalseFalse() {
		testSavePart(ISaveHandler.Save.YES, true, false, false);
	}
	public void testSavePart_YesFalseTrueTrue() {
		testSavePart(ISaveHandler.Save.YES, false, true, true);
	}
	public void testSavePart_YesFalseTrueFalse() {
		testSavePart(ISaveHandler.Save.YES, false, true, false);
	}
	public void testSavePart_YesFalseFalseTrue() {
		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);
	}