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initializing Bins with bins=1 breaks figure #1622
Description
Describe the bug
Similar to #1614, initializing a Bins mark with bins=1 breaks the figure (although oddly a resize event seems to resuscitate it).
To Reproduce
import bqplot
fig = bqplot.Figure()
fig.axes = [bqplot.Axis(scale=bqplot.LinearScale(), label='x'),
bqplot.Axis(scale=bqplot.LinearScale(), orientation='vertical', label='y')]
orig_bins = 1 # breaks figure
orig_bins = 2 # does NOT break figure
bins = bqplot.Bins(scales={'x': fig.axes[0].scale,
'y': fig.axes[1].scale},
sample=[0, 1, 2, 3], bins=orig_bins,
colors=['gray'], size=12)
fig.marks = [bins]
fig
and then later, revising the sample/bins:
bins.sample = np.random.random(20)
bins.bins = 10
if orig_bins != 1, the figure updates as expected. If orig_bins == 1, there do seem to be some updates, but the figure is not correct until the widget is resized.
with orig_bins = 1 and then updating bins.sample and bins.bins:
after resizing the figure:
Activity