Comments on text.texi

[storm@cua.dk (Kim F. Storm)]

You have a few open questions in text.texi:

> @item line-spacing
> @kindex line-spacing @r{(text property)}
> A newline can have a @code{line-spacing} text or overlay property
> that controls the height of the corresponding display line.
> @c ???  Which display line is "corresponding"?

The line ended by the newline.

If the line is continued, only the last display continuation line (the
one ended by the newline) is affected.


> @item line-height
> @kindex line-height @r{(text property)}
> A newline can have a @code{line-height} text or overlay property that
> controls the total height of the corresponding display line.
> @c ???  Which display line is "corresponding"?
> We will call the property value @var{line-height}.

Ditto.


> If @var{line-height} is 0, the newline does not contribute to the
> height of the display row; instead the height of the newline glyph is
> reduced.
> @c ??? That is not clear.  Reduced how much?

To the height of the display line without the newline, i.e. to the
max height of any glyph preceding the newline.

> In that case, any @code{line-spacing} property on
> this newline is ignored.  This can be used to tile small images or
> image slices without adding blank areas between the images.
> @c ??? Precisely which of these features does ``this'' mean?

line-heigth = 0

-- 
Kim F. Storm <storm@cua.dk> http://www.cua.dk