Line plot filling with shape 'hv'

Hello everyone, first of all thanks for all the great work loving the ecosystem!

I have come across some inconsistent behaviour when trying to fill a line graph. I am trying to see when an event happens so I am coloring to ‘tozeroy’ and using the shape of the line as ‘hv’ to give the sharp on/off behaviour. When I zoom in on the graph I can see that only the interior of my graph is colored as expected however in the default zoomed out view I get some sort of stair stepped behaviour, see attached images.

I am using plotly 2.6.0.

Cheers,

import plotly.graph_objs as go
from plotly.offline import init_notebook_mode, iplot

init_notebook_mode()

times = ['2013-04-05 14:37:31.660000', '2013-04-05 14:37:42.093000',
               '2018-01-17 15:50:29.994000', '2018-01-17 15:50:32.429000',
               '2018-01-17 15:50:32.433000', '2018-01-17 15:50:32.434000',
               '2018-01-17 15:50:32.437000', '2018-01-17 15:50:32.441000',
               '2018-01-17 15:50:32.447000', '2018-01-17 15:50:32.472000',
               '2018-01-17 15:50:33.152000', '2018-01-17 15:50:33.253000',
               '2018-01-17 15:50:33.260000', '2018-01-17 15:50:33.469000',
               '2018-01-17 15:50:33.589000', '2018-01-17 15:50:33.619000',
               '2018-01-17 15:50:33.666000', '2018-01-17 15:50:33.929000',
               '2018-01-17 15:51:02.245000', '2018-01-17 15:51:06.216000',
               '2018-01-17 15:52:36.662000', '2018-01-17 15:53:01.143000',
               '2018-01-17 15:53:35.691000', '2018-01-17 15:53:48.111000',
               '2018-01-17 15:53:50.384000', '2018-01-17 15:53:51.972000',
               '2018-01-17 15:53:52.101000', '2018-01-17 15:53:52.280000',
               '2018-01-17 15:53:53.902000', '2018-01-17 15:53:55.112000',
               '2018-01-17 15:53:55.880000', '2018-01-17 15:53:56.296000',
               '2018-01-17 15:53:57.068000', '2018-01-17 15:53:58.329000',
               '2018-01-17 15:53:58.612000', '2018-01-17 15:53:58.666000',
               '2018-01-17 15:53:59.625000', '2018-01-17 15:54:00.422000',
               '2018-01-17 15:54:00.919000', '2018-01-17 15:54:02.347000',
               '2018-01-17 15:54:02.679000', '2018-01-17 15:54:06.715000',
               '2018-01-17 15:55:37.752000', '2018-01-17 18:07:25.560000',
               '2018-01-17 18:08:10.421000', '2018-01-17 18:08:10.451000',
               '2018-01-17 18:08:19.855000', '2018-01-17 18:08:27.388000',
               '2018-01-17 18:08:33.801000', '2018-01-17 18:08:53.831000',
               '2018-01-17 18:08:56.931000', '2018-01-17 18:09:04.399000',
               '2018-01-17 18:09:07.654000', '2018-01-17 18:10:22.277000',
               '2018-01-17 18:13:10.988000', '2018-01-17 18:15:59.751000',
               '2018-01-17 18:29:28.355000', '2018-01-18 09:10:48.440000',
               '2018-01-18 09:10:48.447000', '2018-01-18 09:10:48.456000',
               '2018-01-18 09:10:48.466000', '2018-01-18 09:29:14.894000',
               '2018-01-18 09:29:21.560000', '2018-01-18 09:32:54.324000',
               '2018-01-18 09:37:49.551000', '2018-01-18 10:00:58.762000',
               '2018-01-18 10:03:41.302000', '2018-01-18 10:06:27.101000',
               '2018-01-18 10:12:25.628000', '2018-01-18 10:13:36.824000',
               '2018-01-18 10:18:25.165000', '2018-01-18 10:31:57.689000']

values = [0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
       0, 0, 0, 0, 0, 0]

dff = pd.DataFrame(numpy.array([times, values]).T, columns=['times', 'values'])
dff['times'] = pd.to_datetime(dff['times'])

trace = go.Scatter(
    x = dff['times'],
    y = dff['values'],
    fill='tozeroy',
    line = dict(
        shape='hv',
    ),
)

iplot([trace])```


![image|690x128](upload://npYQngaslurCO8ucQitrjAgnUi6.png)

![image|690x117](upload://pl0vmBpCN6geeEdwEoZjgFJd95B.png)