I am using*\margintext* for comments in the margin. When a comment falls on
the last line of a page, I have to manually add 
*\setupmargintext[voffset=-2em]
*everytime to stop it from flowing into bottom margin.
Is there a way to automatically offset margin text to stop it from 
flowing into bottom margin.
I took a look at *typo-mar.mkiv* to see if an option exists to correct 
this without any success.

*MWE*

\setuplayout[height=6cm,width=5cm,rightmargin=5cm]
\unprotect
% setup the side notes
\setupmargindata
     [margintext]
     [location=outer,
      width=4.5cm,
      align=flushleft,
      stack=yes]

\starttext
   \showframe
   A \crlf A\crlf A\crlf
  %\setupmargindata[margintext][voffset=-2em]
   A\margintext{A margin text.A margin text.A margin text.A margin text.}
\stoptext

Devendra