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Subject: Re: Operation of format-mode-line
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> Date: Mon, 22 Jul 2024 21:58:23 +0000
> From: Heime <heimeborgia@protonmail.com>
> 
> 
> What does this do exactly ?
> 
> (format-mode-line mode-line-buffer-identification)
> 
> The documentation states that 
> 
> "Format a string out of a mode line format specification."
> 
> But what does that mean ?  What is actually returned ?

The formatted string.