hg: jdk/client: 8219156: RTFEditorKit writes background color but doesn't read

[prasanta.sadhukhan at oracle.com]

Changeset: 2d8172254394
Author:    psadhukhan
Date:      2019-02-21 10:33 +0530
URL:       http://hg.openjdk.java.net/jdk/client/rev/2d8172254394

8219156: RTFEditorKit writes background color but doesn't read
Reviewed-by: serb

! src/java.desktop/share/classes/javax/swing/text/rtf/RTFReader.java
+ test/jdk/javax/swing/text/rtf/RTFReadBGColorTest.java