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Fixes #3100 - the problem turned out not to be in our code but instead due to this bug in FloatingActionButton which causes it to briefly appear even when made invisible. This bug doesn't occur on devices running Lollipop, but I reproduced it on 4.1 and 4.4.4.
Note that this has not been fixed in the latest version of the design support library (23), and the suggested solution in that Google issue (use the built-in
So, on pre-L devices we simply don't hide the FAB or animate it in.