Fix ListPopulationTest leaking shell

Author: vogella

tests/org.eclipse.ui.tests.performance/src/org/eclipse/jface/tests/performance/ListPopulationTest.java

@@ -25,6 +25,7 @@
 import org.eclipse.test.performance.Performance;
 import org.eclipse.test.performance.PerformanceMeter;
 import org.eclipse.ui.tests.harness.util.CloseTestWindowsExtension;
+import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.TestInfo;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -40,6 +41,13 @@ public class ListPopulationTest {
 
 	List list;
 
+	@AfterEach
+	public void tearDown() {
+		if (list != null && !list.isDisposed()) {
+			list.getShell().dispose();
+		}
+	}
+
 	protected void openBrowser() {
 		Display fDisplay = Display.getCurrent();
 		if (fDisplay == null) {
@@ -152,4 +160,4 @@ private String[] getItems(int count) {
 	}
 
 
-}
+}