Aha. Actually I have a door, or partition, anyway, sort of like that. It's an accordionlike fanfold door that recedes into a slot in the wall. The top slides in a grooved piece on the ceiling, like what you show. I've also seen solid ones that don't fold but recede into a deep slot in a wall. Never knew what they were called. "Pocket Door" is a good name. I looked at a Country Coach once; it had a solid pocket door that was a pantry when pulled out. Wish I had one like that.
When mine is retracted, it's held by a retaining strap, but it sort of pushes against it and there's no slack. Gotta compress it a bit before you can fasten the strap.
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-- Carl
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