OS X: Character Palette input doesn't work

[David Reitter]

In the Carbon port, one cannot use the "Character Palette" to input  
characters into Emacs.

The original report came from an Aquamacs user.

> It's easy to insert a
> Unicode character in a window from a Keyboard Viewer (e.g. a
> cyrillic character from an Ukrainian keyboard) but I cannot insert a
> Unicode character from the Character Palette. The "Insert" button
> remains grayed out.

I confirmed this for a very recent Emacs CVS version.
The "Insert" function of Character Palette is disabled while in  
Emacs. All other applications are happy to take input from it.

I couldn't find out what the cause of the problem is - I was looking  
for issues with the Carbon event handling and a missing event handler  
for some text input event.