Feature request: Highlight other messages in thread / conversation

I have seen this request come up a couple of times when searching the web, but I couldn't find it on this tracker... so since I just created an account here to report a minor bug, I figured I would go ahead and make this an official feature request on the issue tracker to keep it on the radar.

Specifically, the request is that when your messages are NOT organized by thread/conversation (which is how I prefer it), and the user clicks on a message within a mailbox, the app would lightly highlight the other messages in the same thread/conversation, to help them stand out a bit without having to go into an actual conversation view to find them.

I think Apple Mail does this and perhaps other clients too. It's a small thing, and I know everyone's preferences are different... but for me, this is literally the only tiny thing that MailMate could improve before it is 100% the perfect email client for all of my needs. (At least for now -- I reserve the right to develop other weird preferences and use cases in the future.)

Thanks for the consideration and making an email app that is actually a pleasure to use, and ~99.95% perfect for my purposes.

Cheers,
Matt

PS, I'm sure everyone knows what I mean but just as an example, here's a screenshot of a portion of a mailbox in Mail.app showing the feature there (with the view carefully cropped to avoid any private information or such).