Bug 322403 Showing a shared part with PartState.VISIBLE may not work correctly due to incorrect parent comparisons
We check the parents of the active part against the part-to-be-shown to determine how to respond when PartState.VISIBLE is used but the check is always 'true' for shared parts because getParent() returns 'null' for both parts. This is obviously wrong. We need to update the code to consider placeholders.
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);
	}