[Epiphany] Encoding dialog

[Marco Pesenti Gritti <marco gnome org>]

Chpe has been working on a better design for encoding menu. We are
uncertain about what design is better for the dialog.
The problem is mainly how to allow users to find encoding in a list more
fastly.

A two pane view like gnome-chat:

http://www.gnome.org/~marco/gnomechat-encodings-customise-dialog.png

Here geographical groups are used, probably it would be better to use
groups like we have in current encoding menu.
We could have a "All languages" item selected by default.
A way to get back to the automatic selection could be useful. Maybe add
a third button "Automatic".

A one pane view, with the Automatic/Custom selection done with radio
buttons (ignore the rtl radio).

http://www.gnome.org/~marco/dialog.png

A third alternative could be a tree, with Languages as folders. Though
that's a pain to implement with current code design :/

Mpt thinks the complexity of the second pane is not worth with only 80
items. He seem to be in favor of a tree too ...
(I tend to think 80 items are enough to need some sort of filtering
FWIW).

Opinions ?

Marco