[Bug] TBbalance graph option is ignored

[eparadis]

The TBbalance option changes what rank "loose" or "floating" nodes are aligned to.
https://graphviz.org/docs/attrs/TBbalance/

edotor does not render graphs correctly that use this property.

Repro steps

1. Start a new graph at https://edotor.net/
2. Cut-and-paste the "Floating nodes moved to max rank" example from the GraphViz documentation into the editor

digraph {
    layout="dot"
    TBbalance="max"

    { rank="min"; "min" }
    { rank="max"; "max" }
    "min" -> "middle" -> "max"
    
    "Floater 1"
    "Floater 2"
}

Expected results

• The rendered image has five nodes: three in a chain, and two nodes aligned to the bottom of the image, like so:

(min)
  |
  v
(middle)
  |
  v
(max)      (Floater 1)     (Floater 2)

Actual results

• The rendered image has the floating nodes packed along side the vertical chain of nodes, like so:

(min)
  |
  v
(middle)      (Floater 1)
  |
  v
(max)       (Floater 2)

Notes

• example using 'max' value, same as above
• example using 'min' value
• example of default behavior that does not use TBbalance parameter. edotor incorrectly renders the above options identical to this