Fix an issue where the first tap can be interpreted incorrectly
Fix an issue where the first tap can be interpreted incorrectly

See these tweets for details:
https://twitter.com/Padraig/status/332628116121980928
https://twitter.com/Padraig/status/332630523388239872
LiuDeng/OBShapedButton,PeterStudio/OBShapedButton,ole/OBShapedButton