bug#55862: Removing indent-tabs-mode set to t by default

[Eli Zaretskii]

> Date: Thu, 09 Jun 2022 14:05:49 +0000
> From: goncholden <goncholden@protonmail.com>
> Cc: 55862@debbugs.gnu.org
> 
> I do not know of any mechanism to show (with some symbol) the beginning of 
> each tab and the end of a line when space happens at the end of a line.

Try "M-x whitespace-mode RET".