hg: jdk/jdk15: 8240654: ZGC can cause severe UI application repaint issues

[philip.race at oracle.com]

Changeset: 015533451f4c
Author:    prr
Date:      2020-06-12 09:31 -0700
URL:       https://hg.openjdk.java.net/jdk/jdk15/rev/015533451f4c

8240654: ZGC can cause severe UI application repaint issues
Reviewed-by: serb, jdv, stefank, kcr

! src/java.desktop/windows/native/libawt/java2d/windows/GDIBlitLoops.cpp
! src/java.desktop/windows/native/libawt/windows/awt_Cursor.cpp
! src/java.desktop/windows/native/libawt/windows/awt_PrintJob.cpp
! src/java.desktop/windows/native/libawt/windows/awt_TrayIcon.cpp
+ test/jdk/java/awt/Graphics2D/LargeWindowPaintTest.java
+ test/jdk/java/awt/print/PrinterJob/AlphaPrintTest.java