hg: jdk8u/jdk8u-dev/jdk: 8261867: Backport relevant test changes & additions from JDK-8130125

[paul.hohensee at gmail.com]

Changeset: 5e357683237b
Author:    andrew
Date:      2021-03-31 22:03 +0000
URL:       https://hg.openjdk.java.net/jdk8u/jdk8u-dev/jdk/rev/5e357683237b

8261867: Backport relevant test changes & additions from JDK-8130125
Summary: Backport changes to bug6980209.java, JSplitPaneOverlapping.java, TestXEmbedServer.java, plus 3 new tests.
Reviewed-by: phh, serb

! test/java/awt/EventQueue/6980209/bug6980209.java
+ test/java/awt/Frame/NonEDT_GUI_DeadlockTest/NonEDT_GUI_Deadlock.html
+ test/java/awt/Frame/NonEDT_GUI_DeadlockTest/NonEDT_GUI_Deadlock.java
! test/java/awt/Mixing/AWT_Mixing/JSplitPaneOverlapping.java
+ test/java/awt/font/GlyphVector/TestLayoutFlags.java
+ test/java/awt/font/Underline/UnderlineTest.java
! test/java/awt/xembed/server/TestXEmbedServer.java