The heights of the alternating shaded rows in the category section (i.e., cat1, cat2, cat0) look uneven. The rows with a grey background look much shorter than the row with the white background.

Forcing all rows to be the same color shows that there is some margin between rows, and that the rectangles are the same height throughout.

Some ideas for a fix/workaround:

• reduce the margins/padding between rows
• set shading_color=0.0 (all the rows are uncolored)
• set a color for all rows (e.g., alternating opacities, or allow parameter for even row colors (i.e., shading_color_odd and shading_color_even)
  • example: