Emoji with CoreText

[John Ralls <jralls ceridwen fremont ca us>]

Behdad,

Even with gtk-3.22.30, cairo-1.15.12, and pango 1.40.12 I'm not able to get most emoji (and not just the 
color ones) to display in GtkEntry or even in the Gtk emoji picker. I've tried setting font-family: Apple 
Color Emoji in gtk.css. Does the pango CoreText backend need some work to support this? How about flipping 
the font family to Apple Color Emoji to display the emoji block of code points if a different family is used 
for the "regular" text?

Regards,
John Ralls