Jason Simmons b1839003b3 Extract the WindowInsetsAnimation.Callback subclass into a separate class that will be lazily loaded (flutter/engine#21548)
WindowInsetsAnimation.Callback was introduced in API level 30.  This
PR moves the text input plugin's WindowInsetsAnimation.Callback subclass
into a class that will only be loaded if the embedding has checked for a
sufficient API level.

See https://github.com/flutter/flutter/issues/66908
2020-10-02 11:23:42 -07:00
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