bug#16470: 24.3.50; term mode and newlines with some window configurations

[martin rudalics]

>  > Your fix works and makes sense. The documentation of window-width
> says: "[If] a column at the right of the text area is only partially
> visible, that counts as a whole column; to exclude partially-visible
> columns, use `window-text-width'."
>
> That text was my invention though.  I simply adapted the doc-string of
> `window-body-height' which says
>
>   If PIXELWISE is nil and a line at the bottom of the text area is only
>   partially visible, that counts as a whole line; to exclude
>   partially-visible lines, use `window-text-height'.
>
> to the width specification.

I now restored the old truncation behavior of `window-body-width' and
also that of `term-window-width'.  Please tell me if there are any
problems.

martin