[Python] How to prevent legend being truncated in bokeh?

Here's a short Python3 script that draws a bunch of sine waves with bokeh (2.2.1).

import numpy
import bokeh.models
import bokeh.plotting

x = numpy.linspace(0, 4*numpy.pi, 100)
sinx = numpy.sin(x)

bokeh.plotting.output_file("truncatedlegend.html")

plot = bokeh.plotting.figure(toolbar_location="above")

glyphs = [ plot.line(x, (1 + i/20)*sinx, line_width=2) for i in range(41) ]

legend = bokeh.models.Legend(
items=[
("%.2f*sin(x)" % ((1 + i/20)), [ glyphs ]) for i in range(41)
]
)

plot.add_layout(legend, 'right')

bokeh.plotting.show(plot)


The legend should have 40 entries, but there's only space for 24 of them, so the rest are thrown away. I tried changing the margin of the plot,

margin = plot.margin
plot.margin = (margin[0], margin[1], margin[2] + 600, margin[3])


and it did increase the available space (in that a second plot (not shown), moves down)---but the legend doesn't expand into the available space.

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