Classic editor cursor control

[jjb100]

Since wordpress 6.4.1 or a version before, the classic editor reacts strangely to keystrokes.

If you press the "cursor left" or "cursor right" keys on the PC keyboard, the edited text always scrolls up or down several lines "uncontrollably".

The edited line often disappears from the screen, so that you lose the orientation to your work.

This happens under Windows 10 Pro regardless of the browser used (Firefox, Opera).

[Presskopp]

Duplicate of #59978.