By Dave Snelling Gmail users might want to check they have the latest version of this popular messaging service installed on their devices if they want access to a ‘game-changing’ new feature. It appears that many Android phone users – including those with Galaxy and Pixel devices – are suddenly seeing a new option to “Select all” when checking their inbox. That might not sound particularly thrilling but selecting multiple emails at once rather than tapping on each one individually has been something users have been wanting for years. It basically means you can select all of the messages displ…