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I would also like to file a complaint:
when typing a message (at least in the quick reply window, but it seems to happen in extended mode as well)
only on a mobile phone (Chrome browser, Android 8)
the cursor behaves strangely. In some cases, it "jumps" unpredictably across the already typed text.
That is, I type something, then see that there's some issue on the previous line (most likely, I need to delete extra characters), I delete them. I try to continue typing in the part of the text where I stopped before (at the end), clicking there. The cursor appears at the end of the text, everything is normal. I start typing – suddenly the cursor moves back to where I performed the character deletion operation, and I start typing as if I were there.
It's hard to describe, hard to reproduce, but it really happens often, sometimes several times in a row, and it's very annoying...