🚀 go-pugleaf

I have a VT100/VT102 emulator (a GraphOn GO-140).  It does something that
I think may be a bug in the firmware:  When it gets an escape sequence
to insert or delete a line (I think), any lines that get moved up
(from the bottom to the top of the screen) leave their attributes in
one place and their text in another.
I am not really sure exactly what is going on, but to test this out,
anybody whose got `less', which scrolls up and down, run less on a
file with ctrl-H boldfacing or underlining sequences, position it such
that a line with underlining or boldfacing is one the first line of
the screen and hit `k' a few times to move up (this won't work if the
underlined text is on the first line of the file).  Do you get the
underlining on the blanks in the same positions on other lines above?