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VisualBlockBoundaries [Vim Script]

Determine the boundaries of a visual selection and return them in a dictionary. 
fu! VisualBlockBoundaries()
  " IMHO, the first line starts on line 0,
  " and the first character starts with character 0
  " therefor the adjustments with -1
  let l:ret = {
  \ 'line_b': line("'<") - 1,
  \ 'line_e': line("'>") ,
  \ 'col_b' : col ("'<") - 1,
  \ 'col_e' : col ("'>")
  \ }
  
  return l:ret
endfu