In message templates is it possible to collapse or hide the incident thread?

Summary:

Content (required):

I'd like to have a button or a link to click to view/expand the full incident thread. Something like what you see when an email message gets clipped "View entire message here." Is this possible?

Version (include the version you are using, if applicable):

21B

Code Snippet (add any code snippets that support your topic, if applicable):