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This layout is far more commonly used on mobile devices, and allows for much easier typing. The keyboard primarily functions through gestures in the four cardinal directions to select which vowel kana to select. In addition, users can cycle through each kana row by tapping the key within a 2-second window (this is the equivalent to T9 input for Japanese phone keyboards). This also resolves the long-standing issue that the old keyboard did not correctly handle dakuten (there was a standalone dakuten key which added a stray dakuten mark, and the umlat mode which added dakuten to all of the keys it could) and could not input handakuten characters at all. In order to allow adding dakuten and cycling through the various modifiers for the previous kana, we need to wrap the input-box (similar to korean) but luckily we don't need any state machine magic since we just need to modify the last character in the character buffer. However because the tap timeout for T9-like-cycling needs to be reset after any non-tap key we need to add some basic wrappers around a few other input-box methods. Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
