gtk-demo: Avoid invalid OpenType feature tags
authorMatthias Clasen <mclasen@redhat.com>
Mon, 3 Aug 2020 01:11:30 +0000 (21:11 -0400)
committerMatthias Clasen <mclasen@redhat.com>
Mon, 3 Aug 2020 01:13:37 +0000 (21:13 -0400)
commitaf07cfea5ff74fb99829f3f02b09d620b0976eca
treec2e30288e55cfbb87773544f605091b2dfa21058
parent0d98bab82bbd1ca86d5db8ba12c0a7ef569f7590
gtk-demo: Avoid invalid OpenType feature tags

ss00 doesn't exist, and we use xxxx as placeholder
for 'default' choices in alternatives. Add a warning
in case we run across invalid OpenType feature tags
in fonts.

Fixes: #2962
demos/gtk-demo/font_features.c