Comment 4 for bug 21637

I verify that this bug exists.

What happens is that Xorg is able to send the mentioned characters, however, somewhere in both GTK+ and QT applications cannot receive them.

To verify, run an X application such as "xterm" (is there an old-style X editor around?).

Try
$ xterm -font "-bitstream-dejavu sans mono-medium-r-normal--0-0-0-0-c-0-iso10646-1"

Then, switch the keyboard to Greek Polytonic:
άὰἁἀᾷᾶὰἇῢ

I cannot figure out why some characters are excluded and other are not.

This issue is not directly related to the upstream bug report in GTK+.