[9] Review Request for 8139215: RTFEditorKit does not save alignment

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:
bug: https://bugs.openjdk.java.net/browse/JDK-8139215
webrev: http://cr.openjdk.java.net/~ssadetsky/8139215/webrev.00/

RTFEditorKit's writer functionality is limited and doesn't support 
writing of rtf paragraphs alignment. The proposed fix introduces support 
for the rtf paragraph alignment.

--Semyon