draw_svg() is buggy

Looks like it’s dropping all unary and standalone nodes, and relabelling all of the other nodes accordingly. For example this code:

# Modify this code.
nodes_ex = io.StringIO("""\
id      is_sample   population      time
0       1       0               0.0
1       1       0               0.0
2       1       0               0.0
3       1       0               0.0
4       1       0               0.0
5       0       0               1.0
6       0       0               1.5
7       0       0               2.0
8       0       0               3.0
9       0       0               3.5
10      0       0               4.0
""")
edges_ex = io.StringIO("""\
id      left            right           parent  child
0       0.00000000      1.00000000      5       0
1       0.00000000      1.00000000      5       1
2       0.00000000      1.00000000      6       2
3       0.00000000      1.00000000      6       3
4       0.00000000      0.50000000      7       5
5       0.50000000      1.00000000      8       5
6       0.50000000      1.00000000      8       6
7       0.00000000      0.50000000      9       6
8       0.00000000      0.50000000      9       7
9       0.50000000      1.00000000      10      8
""")

# Load the tree sequence.
ts = tskit.load_text(nodes=nodes_ex, edges=edges_ex, strict=False)

# Test by plotting it.
display(SVG(ts.draw_svg()))

draws a tree sequence like this:

but it should look more like this:

[gtsambos]

Yes; I’m happy to poke around, but I won’t have time for a few days. The height problem was logged in #319 also.

[jeromekelleher]

Works for me I think… Can you reproduce with the latest master?