hg: jdk-updates/jdk11u-dev: 8235638: NPE in LWWindowPeer.getOnscreenGraphics()

[goetz.lindenmaier at sap.com]

Changeset: 8449eccdf369
Author:    serb
Date:      2019-12-13 18:37 -0800
URL:       https://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/8449eccdf369

8235638: NPE in LWWindowPeer.getOnscreenGraphics()
Reviewed-by: dmarkov, aivanov

! src/java.desktop/macosx/classes/sun/lwawt/LWWindowPeer.java
+ test/jdk/java/awt/Frame/GetGraphicsStressTest/GetGraphicsStressTest.java