test/javax/swing/LookAndFeel/8145547/DemandGTK3.sh

rev 14031 : 8159690: [TESTBUG] Mark headful tests with @key headful.

Backport of 14851:980da45565c8 from jdk9.  542/842 hunks applied directly from
the patch. 44 I resolved manually.  The remaining hunks are for filenames that
do not exist in jdk8u.

@@ -25,10 +25,11 @@
 
 
 #   @test
 #   @summary  Try to force GTK3. We must bail out to GTK2 if no 3 available.
 #
+#   @key headful
 #   @compile ProvokeGTK.java
 #   @requires os.family == "linux"
 #   @run shell/timeout=400 DemandGTK3.sh
 
 #