[MlMt] Prevent displaying content of multiple messages?

[Michael Hucka]

I use the "widescreen" layout in MailMate.  When I select a single 
message in the message list, the message view pane displays the message 
header and body.  However, when I select multiple messages in the 
message list pane, MailMate displays the bodies of multiple messages.  
This wouldn't be a problem except that if select a whole bunch of 
messages, MailMate still does that, and becomes sluggish and even hangs 
for a time [1], probably because it's working hard at formatting the 
different messages bodies.

Is there a setting that would let me prevent this behavior, i.e., make 
it so that if more than one message is selected, it won't attempt to 
display multiple bodies?

[1] On a 4-core, 4.2 Ghz iMac 2017 with 32 GB RAM, so not for lack of 
computing resources.

Best regards,
MH
--
Mike Hucka, Ph.D. -- mhucka at caltech.edu -- 
http://www.cds.caltech.edu/~mhucka
Dept. of Computing + Mathematical Sciences, California Institute of 
Technology