Hi, 

I have encountered another issue with columns: it seems that in some cases the height of the content is not entirely accounted for. From the small experiments I made, the problem seems to only occur when the content of the left column is larger than the content of the right one by a fraction of the line height. 
The example below demonstrates the issue.

The same issue seems to occur with \startboxedcolumns ... \stopboxedcolumns but not with \startsimplecolumns ... \stopsimplecolumns.

Is there a way to have a frame or hrules around the full content of \startcolumns ... \stopcolumns?
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\starttext
  % The left frame is slightly too small
  \startcolumns[n=2,frame=on]
    Line \par
    \blank[1.5ex]
    Line \par
    Line \par
    Line
  \stopcolumns
  
  \blank[big]

  % Same issue with hrules: the lower one overlaps with the content of the left column
  \hrule
  \startcolumns[n=2]
    Line \par
    \blank[1.5ex]
    Line \par
    Line \par
    Line
  \stopcolumns
  \hrule

  \blank[big]

  % Same issue with \startframed ... \stopframed
  \startframed[offset=none]
    \startcolumns[n=2]
      Line \par
      \blank[1.5ex]
      Line \par
      Line \par
      Line
    \stopcolumns
  \stopframed
 
  \blank[big]

  % Using strut=local seems to fix the issue in this case...
  \startframed[offset=none,strut=local]
    \startcolumns[n=2]
      Line \par
      \blank[1.5ex]
      Line \par
      Line \par
      Line
    \stopcolumns
  \stopframed
 
  \blank[big]

  % ... but becomes a problem on this example...
  \startframed[offset=none,strut=local]
    \startcolumns[n=2]
      A longer phrase which does not fit on one single line \par
      Line \par
    \stopcolumns
  \stopframed
 
  \blank[big]

  % ... which works fine without strut=local
  \startframed[offset=none]
    \startcolumns[n=2]
      A longer phrase which does not fit on one single line \par
      Line \par
    \stopcolumns
  \stopframed
 
  \blank[big]

  % Using \startsimplecolumns ... \stopsimplecolumns seems to consistently give a good enough frame
  % (although with maybe a bit too much white space at the bottom in this case)
  \startframed[offset=none]
    \startsimplecolumns[n=2]
      Line \par
      \blank[1.5ex]
      Line \par
      Line \par
      Line
    \stopsimplecolumns
  \stopframed
\stoptext
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Cheers,
Florent