bug#44065: 28.0.50; SVG image not shown completely

[Eli Zaretskii]

> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Sun, 25 Oct 2020 17:12:24 +0000
> 
> immediately before the call to rsvg_handle_get_dimensions, then:
>  - bug44206 image 222.svg is rendered correctly
>  - bug44065 image 1.svg is still clipped on the bottom and right edges.
> 
> Both of these images render correctly in emacs 27.1.50 built from the
> emacs-27 branch, using the same librsvg headers and runtime library.

Emacs 27 doesn't wrap SVGs with another SVG, so the fact that 27 works
doesn't tell us much, right?  This code is entirely new in Emacs 28,
and AFAIR we introduced it because we wanted to be able to use our own
colors with images that don't specify theirs.