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That's usually how it's done if you can't just replace the door with one that's not warped. There are a lot of legendary cures to warped wood, nothing I would try professionally but I've heard pouring boiling water on it can work. If you get a wider door stop you can trim it to fit the warp in the door and still have it in the right place at the front, it looks a bit better that way.
Warped doors are the carpenters nemesis. It's the kind of thing I wake up in a sweat about when I'm buying doors.
Any tips for sorting out an internal door that won't close properly?
The door frame is out of whack in the door opening direction. Hard to describe, but the frames hinge side and top edge are fine, but the handle side is not plumb, so when I close the door it closes nicely on hinge side, top side and top of the handle side, but leaves a 25mm gap at the bottom of the handle side. Was thinking of pulling off the stop and setting it back on at an angle, but I fear it would look a bit naff.