dear @SlackHQ please please please:
do not just discard my changes when I edit a message and click Esc
at this point I can add a loooooot of changes and by simply clicking Esc - all of them are gone without any possibility to restore those 
Howdy! 
Thanks for sharing that with us, we're sorry for any trouble. While adjusting this functionality isn't on our immediate roadmap, we can certainly see how it could be helpful and we'll make note of your use case here.
