Tabulator with row_content : not toggling (collapse/expand) properly

[jleonard99]

ALL software version info

Panel:  1.5.1
Python: 3.12.6
Quarto: 1.5.57
Jupyter: 5.7.2

Description of expected behavior and the observed behavior

Desired behaviors

• Row contents - BUG - the row contents are not redrawn after first collapse, for example when toggled.
• Row contents - prefer that they be collapsed on start. Current default is expanded.

Observed behaviors

• row contents are expanded on start ( row contents are not displayed when triangle is toggled.

Here is a larger example of the issue in the wild. Here is a tabulator with row_content:

• https://vcu-ssg.github.io/ssg-quarto-soc-analysis/31_explore.html

I’d like the row_content to be collapsed on loading. An older version of panel had this default. Since upgrading the code my row_content is expanded on loading.

Complete, minimal, self-contained example code that reproduces the issue

import pandas as pd
import panel as pn

pn.extension('tabulator')

# sample dataframe
data = {'name': ['Alice', 'Bob', 'Charlie'],
        'Value1': [10, 20, 30],
        'Value2': [3, 2, 5],
        }
df = pd.DataFrame(data)

# function to return row contents
def content_fn( row ):
    return pn.pane.Markdown(
        f'# Row contents\n name: {row["name"]}',
        sizing_mode='stretch_width'
    )

# tabulator object with row_contents
sample_table = pn.widgets.Tabulator(
    df, height=350,
    layout='fit_columns',
    sizing_mode='stretch_width',
    row_content=content_fn,
    embed_content=True,
    expanded = []
)

sample_table

[holovizbot]

This issue has been mentioned on HoloViz Discourse. There might be relevant details there:

https://discourse.holoviz.org/t/tabulator-with-collapsed-row-content-by-default/8301/6