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There seem to be a ton of really bad autogrow textarea plugins for jQuery. I want my autogrowing text box to be as good as Facebook's. I want it to fit the current line only, and add a line right before it's needed.
Most of the plugins I've reviewed try to guess line height from number of characters, which seems too naive. I've read one solution that creates a hidden div to calculate height. That seems like the right path, but that solution wasn't in plugin form.
What's out there that does what I want and is easy to install?