The quickest way to achieve that is to go directly into the database and saving the template there, and never saving it inside SuiteCRM.
It’s in the email_templates table.
There are ways to get the editor to behave a little bit better (it also depends on exactly which content you have), but as you can see by my last post, it can get tricky. If you want to try just one (which might be enough), try this one.
I have to say: I am at a point where I fully understand the workings of editors and templates, and I have no intention of leaving this broken just to get more add-on sales. I would gladly push solutions into core.
What is really stopping me is a) lack of time and more importantly, b) I’ve stopped making any substantial new PR’s (made a couple of really basic ones), until I start seeing my years-old PR’s getting merged…