[luatex] Q: What is a "running" glue dimension in rule node?

[Heiko Oberdiek]

On Fri, Mar 12, 2010 at 09:32:51AM +0100, Patrick Gundlach wrote:

> \vrule width 1mm
> 
> and this looks like it turns out to a node like this:
> 
> rule: width=186467, height=-1073741824, depth=-1073741824
> 
> Now looking at the reference manual, it states (8.1.2.3) that the special
> value "-1073741824" is used for ?running' glue dimensions. What is a
> running glue dimension? Does that mean that there is no height and depth
> given in TeX's input?

The height and depth will be taken from the surrounding box.

Yours sincerely
  Heiko