bug#59802: 30.0.50; Checkbox button not rendered

[Eli Zaretskii]

> From: Manuel Giraud <manuel@ledu-giraud.fr>
> Cc: stephen.berman@gmx.net,  59802@debbugs.gnu.org
> Date: Tue, 13 Dec 2022 17:16:28 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> [...]
> 
> > I'm not sure I understand the reason for "else if".  Isn't possible
> > that both conditions could be true?
> 
> True for both conditions is unlikely because we are into a "if (! (0 <
> viewbox_width && 0 < viewbox_height))" so either viewbox_height is zero
> or viewbox_width is zero.

Perhaps this means you need to reshuffle the code so that the case
where both dimensions are non-zero comes the first.  Then you will
have fewer negations in the conditions and the code will be easier to
read and understand.

Thanks.