Rulers in BlockNote.Net

Legend (n and m here are some decimal digits):

healthy columns:
  nn fixed column, width of the column in pixels
nn% percentable column, width of the column in percents
<nn> auto column, nn here actual width in pixels
>nn< auto column reached its' minimum
problem columns:
  nn(mm) fixed column, declared as nnwidth but resized to mm pixels.
nn% percentable column but not enough space to render it using nn% value.