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d0ce4d07a3
Scrolling within textareas on the page is a bit grim. Which is why we don’t do it for the textboxes that people use to edit templates. This commit will allow us to extend the auto-resizing of `<textarea>`s to those which don’t need the highlighting of placeholders. The code is still quite coupled to the placeholder highlighting code, because both work by copying the content of the `<textarea>` into a `<div>` that underlaps the textbox. This `<div>` is used for both rendering the placeholder highlights, and calculating the natural height of the content. So it would be hard/confusing to split the two bits of code into separate modules.