Fix for stylized DataFrame

[abidlabs]

Fixes a regression: #6315

Sample code:

import pandas as pd 
import gradio as gr

# Creating a sample dataframe
df = pd.DataFrame({
    "A" : [14, 4, 5, 4, 1], 
    "B" : [5, 2, 54, 3, 2], 
    "C" : [20, 20, 7, 3, 8], 
    "D" : [14, 3, 6, 2, 6], 
    "E" : [23, 45, 64, 32, 23]
}) 

# Applying style to highlight the maximum value in each row
styler = df.style.highlight_max(color = 'lightgreen', axis = 0)

# Displaying the styled dataframe in Gradio
with gr.Blocks() as demo:
    gr.DataFrame(styler)
    
demo.launch()

Explanation: the introduction of

		on:change={(e) => (value = e.detail)}

was causing an infinite loop when working with metadata. This fixes it, but as I'm not sure if this is the best fix, feel free to suggest an alternative. But basically here, we check to see if a Dataframe is interactive before updating the value. I've tested with matrix_transpose, which continues to work.

I also added a functional test since neither the backend nor the frontend tests alone caught this.

[gradio-pr-bot]

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---

Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/d6efc43171ece506ce41ad8601142553efaa7f56/gradio-4.1.1-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@d6efc43171ece506ce41ad8601142553efaa7f56#subdirectory=client/python"

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/dataframe	minor
gradio	minor

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Fix for stylized DataFrame

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[hannahblair]

Works for me!

edit: i'm trying to work out why this would break it though 🤔

[abidlabs]

Thanks @hannahblair I'll merge this in so that we can get a release out with the fix. Let me know if you can figure out why this fix was needed (cc @pngwn as well)