It's kind of how it works with EMail. You can save EMails that you aren't ready to send yet in the "Drafts" on the left of the account page. That's what I think it should be like for Scratch. There could be a "Comment Drafts" section on your profile page that only you can see. and it could take you to this page of drafted comments on your account, like it could say "Your comment on [project's name] by [username]" and below, it would show you what your comment looks like so far. THEN, when you're ready, you can post the comment and it would be taken out of the "Comment Drafts" page on your account. What do you think?
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this isn't necessary. comments just aren't big enough to merit such a complicated system. this is akin to writing down and revising everything you say before you say it.
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