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Rich text editors are hard. When you drill down into how they actually work, it's a wonder why there are so many of them, and why developers would willingly spend a significant part of their life working on one. At XenForo we have been through ... counts on fingers ... three different rich text editors in our history, so if we're being generous we can at least attest to what a feat of engineering they are and how difficult they can be to get right -- and all we have...
