test/javax/swing/plaf/synth/SynthButtonUI/6276188/bug6276188.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.

@@ -20,10 +20,11 @@
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 /**
  * @test 1.4 08/08/05
+ * @key headful
  * @bug 6276188
  * @library ../../../../regtesthelpers
  * @build Util
  * @author Romain Guy
  * @summary Tests PRESSED and MOUSE_OVER and FOCUSED state for buttons with Synth.