[cairo] Fix a thinko in color glyph support

[Matthias Clasen]

On Fri, May 31, 2019 at 9:59 AM Matthias Clasen <matthias.clasen at gmail.com>
wrote:

> I've spent some time tracking down a GTK+ / Pango crash (
> https://gitlab.gnome.org/GNOME/pango/issues/346 ).
>
> Turns out that there was a thinko in our original color glyph patch. We
> can't modify the passed-in text.
>
> Here is a quick fix:
>
>
> https://github.com/matthiasclasen/cairo/commit/79ad01724161502e8d9d2bd384ff1f0174e5df6e
>
> This probably needs to go into a stable cairo branch too.
>

Hi, two months on, this is still not in git. It is a very easy memory
corruption patch.
We ship the patch in Fedora, but I would prefer to not rely on distros to
pick through
the rubble. Can we get this merged, please ?
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