WhatsApp removed the most “I can't believe this didn't already exist” feature this week: message draftNow, WhatsApp tells you if you have unsent messages typed in a chat so you can return to them later.
To let you know about drafts, messages you've started composing will appear with a green and bold word “Draft” followed by what you've typed. This way, when you open the app you can think about closing it and not accidentally ignore your friends (though I suppose you could still do that on purpose.)
Drafts also end up at the top of the chat list, so you don't have to scroll to find lost ones. This feature is now available in apps worldwide, Engadget reports,