cursor.addEventListener('compositionend', e =>{
	console.log('End composition: %o', e.data);
	if (!e.data) return;
	if (mode !== 'normal') return;
    deleteText(e.data);
});
var originalHandleKey = moustrapOnEdit.handleKey;
moustrapOnEdit.handleKey = (character, modifiers, e) =>{
	_log(`The current mode is ${mode} mode.`);
	
	// 文字入力を握りつぶす
  	if (character.match(/^.$/) && mode === 'normal') {
		e.stopPropagation();
        e.preventDefault();
  	}
  	if (['del','backspace'].includes(character) && mode === 'normal') {
		e.stopPropagation();
        e.preventDefault();
	}
    return originalHandleKey(character, modifiers, e);
};