Add the following to a flutter create template app:
print("counter: ${_counter}");
print("foo");
In the setState call where the counter in incremented.
You'll notice sometimes the logs come out twice:
counter: 15
counter: 15
foo
counter: 16
foo
counter: 17
foo
counter: 18
foo
counter: 19
foo
counter: 20
foo
counter: 21
foo
counter: 21
foo
@lukef was seeing this as well