Missing character glyph
Needs a way to designate/design missing character glyph to show when character is not yet created in font. For now all font I create in Glyphr represent missing characters as tall rectangles that sometimes are taller than text lines.
This is a good idea. Fonts must have a .notdef glyph defined, so there will be a default. But allowing the user to edit the default shouldn't be too hard.