Again, noted in the SAA: If there is not enough space for at least three dots, they should be omitted.The documentation you linked to (thanks for that) says there must be room for two or more dots, not three.
But in either case, it is not adhered to in actual command displays. If the prompt is 29 characters (i.e. the text ends at column 30) you get one dot, which is all there is room for.
I appreciate your response. Now I know that neither the implementation nor the documentation matches what I consider to be the most sensible behavior.
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