Hi,

some time ago Hans has added these trackers for overfull/underfull hboxes:

I’m wondering if there is something similar for vertical boxes?

I’ve found these trackers:

builders.vspacing

builders.vpacking

builders.page_vspacing

builders.collect_vspacing

But I don’t really understand what they do. (Yes, I’ve tried them.)

Maybe someone can shed some light on this ? (RTFM is a perfectly fine answer, just need to know which manual...)

Then, would it be possible to add a tracker for widows/orphans?  (Or even for prevented widows/orphans ?)

Denis