RE: Added text makes `C-h b' wider than 70 chars

[Drew Adams]

        Better yet, to fix this for all cases, would be to put the
        added text on the next line (indented to be aligned with
        the command name).

    Always putting it on the next line would be worse in the usual case
    since fewer commands would fit on the screen.

I've never seen a list of bindings what would not require vertical scrolling
anyway, so I don't think adding to the vertical dimension would do any harm.
There are not 8 million such commands. In the case I saw, there were 5 of
them.

On the other hand, even a single line that is too wide wipes out the effort
to make all lines respect the standard width. And if a frame is fit to the
buffer, it makes the frame unnecessarily wide.

    Making that text smaller might be an improvement.

That's not a real solution. Adding to the vertical dimension and respecting
the standard width is what we do in general - think of doc strings. We don't
make some doc strings a bit wider, thinking that it might help all of them
fit on the screen. And in the case of doc strings, that really would usually
make them fit on the screen. In the case of `C-h b', the list of bindings is
far too long anyway to fit on the screen, even if we doubled the line
length.