Several non-string keys can have a large label that shouldn't be elided,
for example ctrl, meta, send.
Also, change the cutoff to 3 characters as labels are easily colliding.
The dead-key is replaced by its alternative if there's only one
specified.
Extra keys from every subtypes must be merged together to be able to
make this check.
For each extra key, a list of alternative can be specified. An extra key
won't be added to the keyboard if all its alternatives are already
present on it.
This is useful to avoid having the dead key for an accent and the
accented letters at the same time.
The two layout selection options are replaced by a ListGroupPreference
that allow to enter an arbitrary amount of layouts.
The "switch_second" and "switch_second_back" keys are replaced by
"switch_forward" and "switch_backward", which allow to cycle through the
selected layouts in two directions.
Layouts are changed to place these two key on the space bar.
The backward key is not shown if there's only two layouts.
* Add section mark as an extra key in QWERTY-like layouts that don't have it already
* Add dagger (also double dagger) as an extra key in QWERTY-like layouts
This new class will help write more logs. The LogPrinter is no longer
created everytime the keyboard is opened.
An error log is added if failing to load the custom extra keys.
This is a new section in the extra keys option that allows to enter
arbitrary strings which are then added to the keyboard.
A new string is needed for the title of the section, Android's icons and
strings are used as much as possible to avoid adding more strings.
Keys are stored in the preferences as a JSON array of strings.
The current approach is hard to maintain, for example the last key
"autofill" was not displayed.
This implements a PreferenceGroup that contains the check boxes for
every extra keys without involving listing the preferences in
settings.xml.
A custom layout is used to remove the 'title' text view.
The list of extra keys is moved into the new class.
'ExtraKeyCheckBoxPreference' becomes a nested class.
