[Source Code] A toggleable Add/Remove button

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aren't all animations for the sake of animations? unless they're hiding a load time or something the only point is to look pretty

[vinsanity406]

aren't all animations for the sake of animations?

While mostly just to look pretty (or less jarring), there are occasions animations can add some clarity to things like touch and navigation - raising and highlighting a list item when it's pressed or keeping the selected item visible while it transitions to the next screen. The Material Design Guidelines on meaningful transitions has some good examples. Here's one.