In the 22 branch Carbon Emacs (latest CVS), the font panel (mac-font- 
panel-mode) allows the user to bring up the color picker for  
foreground and background colors.  However, the colors are not set.

I noticed that mac-handle-font-selection gets called after the color  
is set (and the user presses OK in the color picker), but it only gets  
an empty event ("aevt") without a atsu-font-id being available.