SVG rendered differently depending on operating system version

[quozl]

An SVG that does not specify a background is rendered differently across operating system versions;

• Fedora 18, a grey background is used by Paint,
• Fedora 25, a black background is used by Paint.

Probably a change in GTK+ or other libraries.

[quozl]

• Ubuntu 18.04, a grey background is used by Paint.