'Seaborn" template disabling horizontal line in fig.add_shape()

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[nicolaskruchten]

Indeed, this is quite strange! Here’s an easier-to-replicate example:

import plotly.express as px
df = px.data.stocks(indexed=True)
fig = px.line(df, template="seaborn")
fig.add_shape(type = 'line', y0=1.5, y1=1.5, x0=0, x1=1, xref = 'paper', yref = 'y', line_color ='red', line_dash = 'dot')
fig.show()

[jarvas24]

Any updates on this? Seems to still be an issue in plotly 5.4.0 for the ggplot2, seaborn, and simple_white templates:

import plotly.io as pio
{
    t: pio.templates[t]['layout']['shapedefaults']['line']['width']
    for t in pio.templates.keys()
}

{'ggplot2': 0,
 'seaborn': 0,
 'simple_white': 0,
 'plotly': None,
 'plotly_white': None,
 'plotly_dark': None,
 'presentation': None,
 'xgridoff': None,
 'ygridoff': None,
 'gridon': None,
 'none': None}