[MlMt] Ticket opened: Message contents do not appear when Message View first shown

[John Cooper]

I also opened this ticket:

When Message View is enabled while a message is highlighted, the message 
contents do not appear in Message View. To display the message’s content 
in Message View, you must click another message and then click back.

MailMate build 4551, Mac OS X 10.9.5.

#929