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Empty hovers when using charts and columnCount #86

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@nicolaskruchten

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@nicolaskruchten

This is an odd bug but consistently, the hover/tooltip appears empty for line charts in the second (or higher) column when using columnCount... Chart b below has empty tooltips. If I add a chart c with the same definition, and bump columnCount to 3 I have the same problem with that chart too. I've seen the same behaviour with histograms but not pie charts.

import dash, dash_core_components as dcc, dash_html_components as html
import plotly.graph_objs as go

app = dash.Dash()
app.layout = html.Div([
        dcc.Graph(id='a', figure=dict(data = [go.Scatter( x = [1,2], y = [3,4] )])),
        dcc.Graph(id='b', figure=dict(data = [go.Scatter( x = [1,2], y = [3,4] )])),
        ], style={'columnCount': 2})

if __name__ == '__main__':
    app.run_server(debug=True)

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