@Robin I am a dinosaur who did not use file hosting services before. So after you explain an idea it is easy to use. About to identical lines - ws2812 can be in any state at start. Sometimes (rarely) it is in the middle of byte receiving. And one write is not enough to blank display. I think it is enough to send 1 byte (or may be 3 bytes) to sync, but it was easier to send all the buffer instead.
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