[BUG] Double text input on Windows

[biase-d]

https://user-images.githubusercontent.com/47496233/125538033-157e26b3-3f4a-4be5-b834-9397211c3034.mp4

one key press from the keyboard is registering as multiple inputs at once

[dvd-bnc]

Yes got this several times, previously an issue within master. If it isn't fixed flutter side within releasing the newer version then I'll manually build with stable