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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: New line and trailing whitespaces
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 (message from Ergus on Sat, 20 Apr 2024 14:10:34 +0200)
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> Date: Sat, 20 Apr 2024 14:10:34 +0200
> From: Ergus <spacibba@aol.com>
> 
> When the cursor is in an empty line and I press enter, the cursor jumps
> to the new line and indents (similar to what emacs does) but also
> removes the trailing whitespaces in the previous/leaving line.

Emacs does that since a long time ago (unless I misunderstand what you
mean).  In what mode did you NOT see Emacs removing trailing
whitespace from the previous line, and can you show a recipe for
reproducing this behavior?