Reproduces problem with adjusting plot size

bokeh_resize_test.py

from pandas import DataFrame
from bokeh.models.axes import CategoricalAxis
from bokeh.models import Plot, ColumnDataSource
from bokeh.models.ranges import FactorRange
from bokeh.models.glyphs import Circle
from bokeh.models.widgets.markups import PreText
from bokeh.layouts import Column
from bokeh.models.widgets.inputs import Select
from bokeh.plotting import curdoc


class TestResize(object):

    def __init__(self):
        self.plot_source = ColumnDataSource()
        self.plot = Plot()

        self.number_elements = Select(options=['5', '10', '15', '20'], value='20')
        self.number_elements.on_change('value', self.resize_plot)

        self.monitor_box = PreText(width=500, height=50)
        self.update_plot()
        self.make_plot()
        self.update_monitor()

        self.layout = Column()
        self.layout.children = [self.number_elements, self.monitor_box, self.plot]

    def make_plot(self):
        plot = Plot(
            x_range=FactorRange(factors=[str(x) for x in range(int(self.number_elements.value) + 1)]),
            y_range=FactorRange(factors=[str(x) for x in range(int(self.number_elements.value) + 1)]),
            min_border_bottom=10,
            min_border_top=10,
            min_border_right=10,
            min_border_left=10,
            plot_width=int(self.number_elements.value) * 25,
            plot_height=int(self.number_elements.value) * 25,
            outline_line_alpha=0.0,
            toolbar_location=None,
            logo=None)

        circle = Circle(x='x_position', y='y_position', radius=0.5)
        plot.add_glyph(self.plot_source, circle)
        plot.add_layout(CategoricalAxis(), 'left')
        plot.add_layout(CategoricalAxis(), 'above')
        self.plot = plot

    def update_plot(self):
        df = DataFrame()
        df['x_position'] = [x for x in range(int(self.number_elements.value) + 1)]
        df['y_position'] = [x for x in range(int(self.number_elements.value) + 1)]
        self.plot_source.data = ColumnDataSource(df).data
        self.plot_source.column_names = df.columns.tolist()

    def resize_plot(self, attr, old, new):
        self.update_plot()
        self.make_plot()
        self.update_monitor()

        # The below, uncommented, triggers 'Uncaught Error: unknown edit variable' (bokeh.min.js?v=02fddad…:237)
        # self.layout.children = [self.number_elements, self.monitor_box, self.plot]

    def update_monitor(self):
        self.monitor_box.text = ''
        self.monitor_box.text += 'self.plot.plot_width == ' + str(self.plot.plot_width) + '\n'
        self.monitor_box.text += "self.plot.ref['id']: " + self.plot.ref['id']

app = TestResize()
curdoc().add_root(app.layout)