Re: How to Display a Zero Height Line

[Eli Zaretskii <eliz@gnu.org>]

> From: Psionic K <psionik@positron.solutions>
> Date: Thu, 12 Dec 2024 18:00:15 +0900
> Cc: Psionic K <psionik@positron.solutions>, help-gnu-emacs@gnu.org
> 
> > > The background of TODO extends vertically in a graphical client.  I
> > > want the space between the two lines.  I do not want the background of
> > > the TODO to extend to the previous line.  Any and all intended
> > > workarounds are acceptable.  I am merely choosing an implementation of
> > > an effect in Dslide and it doesn't matter how it works.
> 
> > I still don't understand, but did you try to use the :extend
> > attribute?
> 
> Why would I be in such a rush to horizontally :extend that which must
> be vertically truncated?

I thought you wanted the background extended horizontally past the end
of line?

If not, what is it that you want to achieve?  Can you explain your
goal in simple words what kind of background extension are you after?

> I have further inspected the possibility of using empty lines with
> actual newlines in the buffer text.  No combination of assigning the
> current line, an extraneous line used to create space, and the newline
> before the next heading, via overlays with line-height, face height,
> and line-spacing of zero, appear to overcome the font locking
> behavior.

Sorry, I don't understand what you are saying here.  What "font
locking behavior" you want to overcome?

> Directly manipulating the font locking behavior is acceptable if there
> is a precise means of targeting.  I have in the past applied
> properties independent of font locking and then read these via new
> font locking rules.  As an implementation I prefer to avoid it because
> if org learns tree-sitter, my solution will break depending on the
> font locking in use.

I don't understand that, either, probably because it is based on the
previous paragraph, which I also didn't understand.

Sorry for being so dumb.  Feel free to terminate this discussion if it
doesn't help.