test/javax/swing/KeyboardManager/8013370/Test8013370.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.

@@ -39,10 +39,11 @@
 import static javax.swing.JOptionPane.showMessageDialog;
 import static javax.swing.SwingUtilities.invokeAndWait;
 
 /*
  * @test
+ * @key headful
  * @bug 8013370
  * @summary Ensure that key stroke is not null
  * @author Sergey Malenkov
  */