hg: jdk-updates/jdk11u-dev: 8242557: Add length limit for strings in PNGImageWriter

[shade at redhat.com]

Changeset: 09fa16522875
Author:    jdv
Date:      2020-04-30 20:03 +0530
URL:       https://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/09fa16522875

8242557: Add length limit for strings in PNGImageWriter
Reviewed-by: prr, psadhukhan

! src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGImageWriter.java
+ test/jdk/javax/imageio/plugins/png/WriteInvalidKeywordTest.java