Re: New line and trailing whitespaces

[Ergus <spacibba@aol.com>]

On Tue, Apr 23, 2024 at 11:06:02AM GMT, Eli Zaretskii wrote:
>> Date: Mon, 22 Apr 2024 14:22:43 +0200
>> From: Ergus <spacibba@aol.com>
>> Cc: help-gnu-emacs@gnu.org
>>
>> >> That face seems apply only to the tab whitespace when whitespace-style
>> >> has `tabs`, but not to when `tab-mark` applies.
>> >
>> >You lost me here.  But if all you want is to know what face is used on
>> >some text, simply use "M-x describe-text-properties RET" with point on
>> >that text.
>> >
>> Whitespace mode "shows" the tabs in two (independent) ways:
>>
>> 1. "Colorizing" the tab whitespace with some color (face tabs)
>> 2. Add a mark in the whitespace space like | or � (tab-mark)
>>
>> The whitespace-tab face applies only to 1, but I don't find how to make
>> it apply to 2
>>
>>
>> Define the whitespace-tab face foreground and background
>> (setq-default whitespace-style '(faces tab-mark))
>> (whitespace-mode 1)
>> TAB
>>
>> I see: the �, but it is always white, independently of whitespace-tab face.
>
>You need to customize whitespace-display-mappings.  Specifically, the
>tab-mark element of the value is by default the vector '[?� ?\t], and
>you need to replace each of these two characters with a glyph that has
>the face you want, using make-glyph-code.  Caveat: a comment in
>whitespace.el explains why only newlines are given a face:
>
>	      ;; Only insert face bits on NEWLINE char mapping to avoid
>	      ;; obstruction of other faces like TABs and (HARD) SPACEs
>	      ;; faces, font-lock faces, etc.
>

Ahh this is exactly what I want..

Do you think it worth adding your paragraph as a comment somewhere in
whitespace or reference that in its manual section?