a descent editor would have multi-cursor, multi-line edits that could be also configured to do 'inserts' over appends. So you'd use a mouse to "draw" a line (i

a descent editor would have multi-cursor, multi-line edits that could be also configured to do 'inserts' over appends. So you'd use a mouse to "draw" a line (if it's horizontal or vertical), and it'd take only 4 "draw line" to make a box, and turn on 'insert' mode to type in the text inside the box. Drawing diagonal lines is a bit more involved, but not too hard either. Adding a cell to an ascii table is also pretty easy using this same method. However, it is preferable to have the diagram in svg tho. The svg file could even be separate from the comments, but just referenced.