MarkerViewUtilTest: fix leaked shells

#2379

Author: EcljpseB0T

tests/org.eclipse.ui.tests/Eclipse UI Tests/org/eclipse/ui/tests/markers/MarkerViewUtilTest.java

@@ -91,13 +91,15 @@ public void testShowMarkers() throws CoreException {
 		boolean visible = page.isPartVisible(part);
 		assertEquals(true, result);
 		assertEquals(true, visible);
+		page.hideView(part);
 
 		result = MarkerViewUtil.showMarkers(page,
 				new IMarker[] { someBookmarkMarker, someProblemMarker, someTaskMarker }, true);
 		part = page.findView(IPageLayout.ID_BOOKMARKS);
 		visible = page.isPartVisible(part);
 		assertEquals(true, result);
 		assertEquals(true, visible);
+		page.hideView(part);
 
 		result = MarkerViewUtil.showMarkers(page,
 				new IMarker[] { someProblemMarker, someTaskMarker, someBookmarkMarker }, true);
@@ -112,5 +114,6 @@ public void testShowMarkers() throws CoreException {
 		visible = page.isPartVisible(part);
 		assertEquals(true, result);
 		assertEquals(true, visible);
+		page.hideView(part);
 	}
 }