Pasting a new line causes incorrect cursor movement

[zhzz]

Is there an existing issue for this?

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Bug report

Hi,

There is a strange behavior in the current 4.18.0 version. It is easily reproducible on the docs website:

1. Copy a piece of code with a new line in it
2. Paste it somewhere in the editor several times in a row
3. See the cursor moves forward and breaks the code eventually

React-Live-React-Live.webm

[mryechkin]

Looks like a repeat of #377, #343 and #308. It's a shame these cursor issues keep coming back, I would really like to use this library again as it's more maintained than the alternatives, but this is a pretty big blocker.