This activity points to the system settings page for enabling input
methods. This is purely a shortcut but is expected by many users.
It could be made more useful in the future or hidden whenever the
keyboard is enabled.
The previous algorithm did not cut the circle into 16 equal parts.
The division by 2pi yielded numbers smaller than 16, which no longer
made sense after the cast to int.
'Keyboard.Key' now contains an array of size 9, giving each keyvalue an
index. The algorithm for finding the nearest key during a swipe now
needs 16 segments, which are now calculated as an angle.
The algorithm does one more interation instead of 2 more, slightly
reducing the sensitivity of corner values. The 'getAtDirection' function
is moved into the Pointers class to clearly separate the two systems.
The 'edgekey' attribute is now obsolete but is kept for compatibility.
The flag is removed internally, key index are simply translated.
Similarly, the 'slider' attribute now act on keys at index 5 and 6
instead of 2 and 3.
The 'keysHeight' field needs to be updated. As this class is not
intended to be mutable, copy the list of rows and call the constructor.
Also remove an unecessary component of the keyboard height calculation.
A new option changes the "change_method" into the new
"change_method_prev". It switch to the previously used input method.
A long press on "change_method_prev" sends "change_method".
A new section is added in the settings and existing options are moved.
Refactor, follow up of 90b7944. Add a modification step to the "special"
layouts: numpad, greekmath, pin entry.
Remove the apply_key0 function, which is not expressive enough.
Add an enum instead of yet an other "switch_" function.
Send key events for the left or right arrow as the finger slides on the
space bar.
Can be used to select text by holding shift. Works under Termux.
Events are sent linearly as the finger travels. The distance between
each events is defined from the swiping distance divided by 4.
'slider="true"' can be set on a key that have 'edgekeys="true"'.
'key2' and 'key3' represent the right and left keys.
It allowed to modulate the repeat speed of some keys (arrow, backspace,
delete) by move the finger farther or closer to the key.
In practice, this wasn't pratical and doesn't seem popular. It is
removed in favor of a better mechanism for moving the cursor.
Stay on the secondary layout after a config refresh or onStartInputView.
The information is kept until the keyboard is restarted.
Additionally, move tweaking the secondary layout to the Config class now
that physical equality is not needed.
