hg: jdk/submit11: 8204931: Colors with alpha are painted incorrectly on Linux

[philip.race at oracle.com]

Changeset: 331888ea4a78
Author:    prr
Date:      2018-07-31 14:04 -0700
URL:       http://hg.openjdk.java.net/jdk/submit11/rev/331888ea4a78

8204931: Colors with alpha are painted incorrectly on Linux
Reviewed-by: jdv, psadhukhan

! src/java.desktop/unix/classes/sun/java2d/xr/XRGraphicsConfig.java
! src/java.desktop/unix/classes/sun/java2d/xr/XRSurfaceData.java
+ test/jdk/java/awt/Color/AlphaColorTest.java