Re: Redisplay issues with 'space' display properties on overlays

[Eli Zaretskii]

> From: dalanicolai <dalanicolai@gmail.com>
> Date: Sat, 16 Apr 2022 20:40:47 +0200
> Cc: Emacs Devel <emacs-devel@gnu.org>
> 
>  2. I would expect that a specified space (space display property for the 
> 'gap'
>  > overlays, i.e. the space between the pages) could be smaller than the 
> default
>  > 'line-pixel-height`. However, this does not seem possible by just setting a
>  > smaller :height for the space display property, as the overlay will always 
> have
>  > a minimum height of the default 'line-pixel-height'
> 
> Here is again my 'second question'. So after when you do `M-x papyrus-demo`
> (and scroll using the arrows) the 'gaps', which are the gray 'gaps' between 
> the pages,
> have the height of the default `pixel-line-height`. Setting 
> `papyrus-gap-height` larger
> will increase the gap size. However, setting `papyrus-gap-height` smaller 
> will not
> decrease the gap size because it seems that the `line-pixel-height` is the 
> minimum.
> I would expect the size could be smaller, so my question is why the minimum 
> size is
> limited to be `line-pixel-height`...

I think this is because you have a newline after the overlay, and the
newline has the default height.  Did you try to put a face with
smaller :height on the newline?