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emptying Lines data breaks figure #1614
Description
Describe the bug
Emptying the x/y data in a Lines instance clears the mark, as expected, but future updates fail to update on the figure
To Reproduce
import bqplot
import numpy as np
x = np.linspace(0,1,11)
y = x**2
fig = bqplot.Figure()
fig.axes = [bqplot.Axis(scale=bqplot.LinearScale(), label='x'),
bqplot.Axis(scale=bqplot.LinearScale(), orientation='vertical', label='y')]
line = bqplot.Lines(scales={'x': fig.axes[0].scale,
'y': fig.axes[1].scale},
x=x, y=y,
colors=['gray'], size=12)
fig.marks = fig.marks + [line]
fig
(displays as expected)
line.x, line.y = [], []
(clears plot as expected, no errors, but without this line the next line would work as expected)
line.x, line.y = x, 2*x
(plot does not update and remains blank - although grid lines do reappear, the following error appears in the JS console)
Error setting state: invalid format: .undefinedg
Expected behavior
Line should re-appear after setting to be non-empty array.
Activity
fix: set domain to (0, 1) when no data is present
fix: set domain to (0, 1) when no data is present (#1619)
fix: set domain to (0, 1) when no data is present
fix: set domain to (0, 1) when no data is present
Forward port fix scale domain no data bqplot#1619 (bqplot#1620)