Bug: Cannot draw h/v line for the subplot with a 'paper' sticky mode.

[ievgennaida]

plotly 4.14.3

I cannot make a h/v line 'sticky' relatively to the subplots.

'paper' property is respected only when the line is drawn for the whole plot but not for the individual subplots.

See those two lines:

fig.add_shape(line, row=1, col=2)

import plotly.graph_objects as go
import json
import plotly
from io import StringIO
import plotly.express as px
import plotly.graph_objects as go
from plotly.subplots import make_subplots
fig = make_subplots(
            cols=4,
            rows=2,
            # share only in rows:
            #shared_yaxes="rows",
            #subplot_titles=['first','', 'second', 'third'],
        )


a_line = dict(color='rgb(1, 4, 4)')
b_line = dict(color='rgb(44, 160, 101)')
c_line = dict(color='rgb(222, 160, 222)')

# facet 1
fig.add_trace(go.Scatter(y=[1, 1], x=[1,1], legendgroup="A 1", name="A",line=a_line, showlegend = False),1, 1)
fig.add_trace(go.Scatter(y=[1, 1], x=[1,1], legendgroup="A 1", name="A",line=a_line, showlegend = False),1, 2)
fig.add_trace(go.Scatter(y=[1, 1], x=[1,1], legendgroup="A 1", name="A",line=a_line, showlegend = False),1, 3)

# facet 1
fig.add_trace(go.Scatter(y=[2, 2], x=[2,2], legendgroup="B 1", name="B",line=b_line, showlegend = True),1, 2)
fig.add_trace(go.Scatter(y=[2, 2], x=[2,2], legendgroup="B 1", name="B",line=b_line, showlegend = False),1, 2)
fig.add_trace(go.Scatter(y=[2, 2], x=[2,2], legendgroup="B 1", name="B",line=b_line, showlegend = False),2, 2)

# facet 2
fig.add_trace(go.Scatter(y=[1, 1], x=[1,1], legendgroup="A 1", name="A 1",line=a_line, showlegend = False),2, 2)
fig.add_trace(go.Scatter(y=[2, 2], x=[2,2], legendgroup="B 1", name="B 1",line=b_line, showlegend = False),2, 2)

fig.add_trace(go.Scatter(y=[2, 2], x=[2,2], legendgroup="B 1", name="B",line=b_line, showlegend = False),2, 3)
fig.add_trace(go.Scatter(y=[2, 2], x=[2,2], legendgroup="B 1", name="B",line=b_line, showlegend = False),2, 3)
#fig.add_trace(go.Scatter(y=[3, 3], x=[3,3], legendgroup="C", name="C",line=c_line, showlegend = False),row=3, col=3)

line = dict(type="line", xref="x", x0=1.5,  x1=1.5, yref="paper", y0=0, y1=1)

# fig.add_shape(shape, row=1, col=2)

# globally it works:
fig.update_layout(shapes=[line])

# for a specific subplot 'paper' is ignored :
fig.add_shape(line, row=1, col=2)



fig.show()

Might be related issue:

#2980

[ievgennaida]

Works ok when 'y domain' is used.