Re: "Why is emacs so square?"

[Clément Pit-Claudel]

On 17/04/2020 13.16, Eli Zaretskii wrote:
>> Cc: address@hidden
>> From: Clément Pit-Claudel <address@hidden>
>> Date: Fri, 17 Apr 2020 11:52:56 -0400
>>
>> Do you know how the problem with square brackets could be solved?
> 
> Sorry, no.  Custom was always a dark corner for me.

Me too, but fortunately this isn't a question about custom, it's a question 
about features about the display engine.  

There is a way to change the color, backgorund, etc. of a bit of text depending 
on the properties of the display it is on, through the face-specs of defface.  
Is there a similar facility for showing or hiding a piece of text depending on 
properties of the frame it's shown on?  I tried using a conditional 'display 
property, but that doesn't seem to work.