It's common knowledge that Samsung stole from Apple, literally stealing every feature in some way.
The whole Mobile industry was heading in a completely different direction before Apple stepped up.
Pretty old tea.
Anyway, it's why Apple are pretty fearless about taking from Samsung now. Because it's not a big deal if Apple use one or two features from another OS that was built from theirs in the first place.
EDIT: Oh it's from 2012
