Re: Change of behavior of "space" display property and face property

[Qiantan Hong <qthong@stanford.edu>]

I’m on NS. I just git pull’ed and the problem persist.

Emacs version:

GNU Emacs 29.0.50 (build 1, x86_64-apple-darwin21.5.0, NS appkit-2113.50 Version 12.4 (Build 21F79))
 of 2022-10-04

System version: macOS 12.4 (21F79)

Best,
Qiantan



> On Oct 3, 2022, at 11:34 PM, Po Lu <luangruo@yahoo.com> wrote:
> 
> Qiantan Hong <qthong@stanford.edu> writes:
> 
>> Open an empty text file, M-: (insert #(" " 0 1 (face (:underline t) display (space :align-to right))))
>> 
>> On Emacs 28, this produce a blank line with underline.
>> 
>> On Emacs 29, this produce a blank line without underline. In general, “space” display 
>> seem to disregard any face property.
>> 
>> Is this intended or is this a bug? “space” display respecting face property is useful for
>> typesetting. For example. I use it to display a horizontal separator under my header line.
>> 
>> Best,
>> Qiantan
> 
> That is almost certainly a bug, but I cannot be certain without knowing
> what toolkit and window system you built Emacs with.
> 
> I remember fixing something similar on the NS build months back.