test/java/awt/Dialog/ValidateOnShow/ValidateOnShow.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 7027013
   @summary Dialog.show() should validate the window unconditionally
   @author anthony.petrov@oracle.com: area=awt.toplevel
   @run main ValidateOnShow
 */