Bug#995784: python3-gi: Please add "recommends" on "python3-cairo"

[Pierre Ossman]

To add, this is not just to make pip happy, key functionality in GTK/GDK 
is broken when python3-cairo isn't installed.

A simple example that fails:

> import gi
> gi.require_version('Gdk', '3.0')
> from gi.repository import Gdk
> from gi.repository import GdkPixbuf
> pb = GdkPixbuf.Pixbuf.new_from_file('/usr/share/pixmaps/debian-logo.png')
> s = Gdk.cairo_surface_create_from_pixbuf(pb, 1.0, None)
> print(s)

Gives you:

> Traceback (most recent call last):
>   File "/home/cendio/test.py", line 6, in <module>
>     s = Gdk.cairo_surface_create_from_pixbuf(pb, 1.0, None)
> TypeError: Couldn't find foreign struct converter for 'cairo.Surface'

Regards
-- 
Pierre Ossman           Software Development
Cendio AB               https://cendio.com
Teknikringen 8          https://twitter.com/ThinLinc
583 30 Linköping        https://facebook.com/ThinLinc
Phone: +46-13-214600

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?