display alternative glyphs specified with OpenType features
Submitted by Daiki Ueno
Created attachment 309686 screenshot, using Adobe Source Sans Pro
At the Typography BOF at GUADEC, Nathan suggested to show alternative glyphs selected by certain OpenType features (such as cv00-90, ss00-20), along with the base glyph.
I am currently working on it in a branch (screenshot attached): https://git.gnome.org/browse/gnome-characters/log/?h=wip/dueno/font-features
The current approach is to show a floating toolbar on the character dialog, by hovering the cursor on the character label. If it is useful, I would like to include it in 3.17.91.