\addlay does not add interline skip between layers

diff --git a/ucwmac.tex b/ucwmac.tex
index edabe347dffaafd614e5edb59284eaf2de832484..102496e65e2b27b0250d9f793f9955ab93687911 100644 (file)
--- a/ucwmac.tex
+++ b/ucwmac.tex
@@ -121,7 +121,7 @@
 % and underlays, which are zero-size vboxes positioned absolutely in the
 % front / in the back of the normal material. Also, there are global
 % versions of both which are not reset after every page.
-\def\addlay#1#2{\setbox#1=\vbox{\ifvbox#1\box#1\fi\smashedvbox{#2}}}
+\def\addlay#1#2{\setbox#1=\vbox{\ifvbox#1\box#1\fi\nointerlineskip\smashedvbox{#2}}}
 \def\pageunderlay{\addlay\pageunderlays}
 \def\pageoverlay{\addlay\pageoverlays}
 \def\commonunderlay{\addlay\commonoverlays}