frame-visible-p and suspend-tty

[Eli Zaretskii]

The documentation of frame-visible-p says:

    On a text-only terminal, all frames are considered visible, whether
    they are currently being displayed or not, and this function returns
    @code{t} for all frames.

What about a text-only terminal that has been suspended?  The frames
on such a terminal are neither visible nor being updated, and yet this
function seems to still return t for them (unless my testing was
faulty).  That doesn't sound right.