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@warner Thanks for checking out the plug-in! There's no plan to turn Magic Preview into a full-blown text editor or Micro.blog client. It's just a quick way to preview your next blog post and relies on your favorite app for the actual posting.
Regarding the macOS app and the new post window lurking behind the main window, that's something @manton might want to tweak. Maybe the new post window should have focus and appear at the top when a user follows a microblog://post URL?