gtk_css_provider_load_from_data() doesn't load images with absolute file path
The comment at #5628 (comment 1692435) stated that relative file paths don't work with gtk_css_provider_load_from_data().
Now the problem is that using a CSS with background-image: url()
with absolute file path doesn't work either.
gtk_css_provider_load_from_file() works with both absolute and relative paths.