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

[Po Lu]

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.