Re: Making a non-ASCII space character visible

[Will Parsons]

On Sunday, 17 Jun 2018  1:07 AM -0400, Michael Heerdegen wrote:
> Will Parsons <varro@nodomain.invalid> writes:
>
>> I have a desire to use the Unicode character A007 (FIGURE SPACE) in a
>> document and to be able to distinguish it visually from a regular ASCII
>> space.  This seems to be already done in the case of 00A0 (NO-BREAK
>> SPACE) which appears as an underscore with a distinctive face.
>>
>> It *looks* like I should be able to do this via the customization
>> option "Whitespace Display Mappings", but no matter what I do,
>> attempting to "Apply" the changes results in an error message, "This
>> field should contain a single character".
>
> Seems you tried to insert a printed representation of the character?
> AFAIK you must insert the character.  You can achieve this with M-:
> (insert ?\x2007) for example.  Yes, that's not so nice.

No, I inserted the character.  I have occasion to insert miscellaneous
Unicode character sufficiently enough that I have re-bound M-u to
insert-char to make this easier.

>> Feeling desperate, I copied the existing value of
>> whitespace-display-mappings directly into my custom.el file, and
>> manually added a new entry for A007 (8199) on the model of the
>> existing entry for 00A0 (160), but this seems to have no effect on the
>> display.
>
> If you did it right, note that you must re-enable `whitespace-mode' to
> give it a chance to update the `buffer-display-table'.  That doesn't
> happen automatically.

I completely restarted Emacs after doing it.  Also, see my reply to
Eli.

-- 
Will