> While you're there could you please do some idiomatic changes that
> avoid selecting a window in order to calculate its width:
>
> For example, replace
>
> (let ((width
>        (if (window-live-p (get-buffer-window (current-buffer) t))
> 	   (with-selected-window (get-buffer-window (current-buffer) t)
> 	     (window-width))
> 	 (window-width)))))
>
> with something like
>
> (window-width (get-buffer-window nil t))
>
> and
>
> (if (window-live-p (get-buffer-window (current-buffer) t))
>     (with-selected-window (get-buffer-window (current-buffer) t)
>       (frame-width))
>   (frame-width))
>
> with something like
>
> (let ((window (get-buffer-window nil t)))
>   (frame-width (and window (window-frame window))))
>
> Probably you also want to add a version tag for 'Man-width'.

Right, fixed in the next patch where a version tag is added not to
`Man-width', but to the new customizable variable `Man-width-max'.
This is better since like when man-pages are formatted in their
web versions they limit the width using the CSS property `max-width',
so like CSS has both `width' and `max-width', man.el will have
`Man-width' and `Man-width-max'.

Regarding the request for dynamic reformatting, I'm not sure if
man pages should be reformatted on resizing windows (I remember
seeing a window resize hook, but can't find it now).

Such window resize is necessary also for some other modes,
for example, when a visited image is saved to the desktop file,
it has a wrong size after loading the desktop, because the
image size is calculated when the image file is not yet displayed
in a window.  The image size should be recalculated after
displaying the image buffer.