Re: set-text-properties, remove-set-properties, add-text-properties: 1) doc string 2) return value

[Richard M. Stallman]

I can see from the C source that set-text-properties returns t
if that text had any properties before, nil if it had none.

I am not sure whether this is useful to document.

Now is not the time to consider changing the return value.
This is not a new feature, and the current value is not a bug.