Matplotlib plot zooms in on resize when generated via extended task

[cpsievert]

Here's a minimal example:

import time

import matplotlib.pyplot as plt
import numpy as np
import seaborn as sns

from shiny import App, Inputs, Outputs, Session, reactive, render, ui

app_ui = ui.page_fluid(
    ui.input_slider(
        "n", "input_slider()", min=10, max=100, value=50, step=5, animate=True
    ),
    ui.input_task_button("do_plot", "Do plot"),
    ui.output_plot("p"),
)


def server(input: Inputs, output: Outputs, session: Session):

    def do_plot():
        time.sleep(0.5)

        # Without ax, seaborn works through side effects, so supply the ax to avoid
        # one figure from affecting another.
        fig, ax = plt.subplots(1, 1)
        sns.lineplot(x=np.arange(100), y=np.random.randn(100), ax=ax)
        return fig

    @ui.bind_task_button(button_id="do_plot")
    @reactive.extended_task
    async def plot_task():
        return do_plot()

    @reactive.effect
    @reactive.event(do_plot)
    def _():
        plot_task()

    @render.plot
    def p():
        return plot_task.result()


app = App(app_ui, server)

zoom-on-resize.mp4