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I'd like to be able to double-click in a specific location in the preview of the post I'm writing (or editing), and have the site scroll up to the post source (input box), and scroll and move the cursor to the location in the source responsible for that part in the preview.
It's important that a single click isn't sufficient; that would be extremely annoying, for instance when attempting to mark some text in the preview, or when a finger accidentally meets the screen, on mobile (I have painful experience with that elsewhere).