// last focused priority
for (var j = 0; j < focused.key.span(); ++j) {
    var btn = kb.aligned_keys[i][focused.col + j];
    if (btn.key.enabled() && btn.key === kb.last_focused) return btn;
}
// left most
for (var j = 0; j < focused.key.span(); ++j) {
    var btn = kb.aligned_keys[i][focused.col + j];
    if (btn.key.enabled()) return btn;
}