I did it old school and copied the whole thing in the find box, then did pasted the whole thing in the replaced box wrapped around with <xen:comment> </xen:comment>
I deleted a post here in this bug report & now I'm thinking maybe it should have stayed...
Is there a character limit?
And if so, I'd call that a bug. Because there are edits that sometimes require reformatting virtually most the template. Almost replacing the whole thing, but not all of it. And rather than make a bunch of TMC entries, it would be better to make just 1.