test/javax/swing/PopupFactory/6276087/NonOpaquePopupMenuTest.java

rev 14031 : 8160974: [TESTBUG] Mark more headful tests with @key headful.

This is a backport of fe58d505fffd from jdk9. 228/596 hunks apply without
modifications. 16 hunks required manual rework. The remainder were for files
not present in jdk8u.

@@ -21,10 +21,11 @@
  * questions.
  */
 
 /**
  * @test
+ * @key headful
  * @bug 6276087
  * @author Romain Guy
  * @summary Tests opacity of a popup menu.
  */
 import java.awt.*;