On the third level of a organization chart, the number of subordinates
on the right but over the container boundary.
For the second level there was already a special case:
padding-left: $tmp-gap-base;
So for the third a fix could have been:
padding-left: $tmp-gap-base*2;
But this changeset replaces margin by padding so invisible content does
not create a horizontal scrollbar (since we had 100% width with
margin-left that busted it out of its container).
opw-1912437
closes#29043
Nicolas Lempereur
e942c3520b