List multiple layouts by default

[AlanGriffiths]

To make the range of supported layouts clear to developers deploying Frame OSK it would be nice to show the full range of layouts, Vis:

$ ubuntu-frame-osk.list-layouts | cut -f1 -d\  | grep -v -e ID -e Run -e ^$ | tr '\n' ',' | sed s/,$/\\n/
am,am+phonetic,ara,be,bg,bg+phonetic,br,ch,ch+de,ch+fr,cz,cz+qwerty,de,dk,epo,es,es+cat,fi,fr,gr,il,ir,it,it+fur,jp+kana,no,pl,ru,se,th,ua,us,us+colemak,us+dvorak

In theory it is possible to set the default layout option to the above value and allow any of the supported layouts to be selected through the UI.

In practice, squeekboard simply adds all the selected layouts to a menu list (which does not support scrolling) and, with too many items in the list, this goes partially offscreen and is unusable.

Ideally, we would update the squeekboard UI to respect screen boundaries and to work with more layouts than fit on the screen. (And, naturally, propose the changes upstream.)

We could also set the default to a curated list of layouts, but it is unclear what that list should be.

[AlanGriffiths]

The only duplicate layouts in the list are French & Belgian:

$ fdupes -R parts/squeekboard/src/data/keyboards
parts/squeekboard/src/data/keyboards/be.yaml
parts/squeekboard/src/data/keyboards/fr.yaml

parts/squeekboard/src/data/keyboards/be_wide.yaml
parts/squeekboard/src/data/keyboards/fr_wide.yaml

[AlanGriffiths]

Here's an "strawman" curated list on a 1024p display:

$ snap set ubuntu-frame-osk layout=us,am,ara,bg,br,ch,ch+fr,cz,cz+qwerty,de,dk,epo,es,es+cat,fi,fr,gr,il,ir,it,it+fur,jp+kana,no,pl,ru,se,th,ua

[AlanGriffiths]

Note that this goes offscreen on a 720p screen