Auto-Linking URLs

[mjda]

I'm using the editor in one of my add-ons but when someone types a URL into the editor, it doesn't automatically convert to a link. Also, links don't unfurl. All other BBCode seems to work just fine. I'm assuming there is something specific that needs to be done to make this work, but I can't figure it out. Hoping one of you can point me in the right direction.
Auto-Linking URLs

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