Spanners use 'id' as a label and not 'label'.

[aussetg]

Description

Spanners use 'id' as a label and not 'label', despite what the documentation says.

Reproducible example

import polars as pl
from great_tables import GT

(
    GT(
        pl.DataFrame({'a': range(5), 'b': range(5)}),
    )
    .tab_spanner(label='True Label', id='false_label', columns=['a', 'b'])
)

Expected result

A spanner called 'True Label'.

Development environment

• great_tables Version: 0.4.0

[jrycw]

It appears that the issue originates from the following line:

great-tables/great_tables/_utils_render_html.py

Lines 179 to 181 in b4d102a

	spanner_ids, spanner_col_names = spanners_print_matrix(
	spanners=data._spanners, boxhead=boxhead, include_hidden=False, ids=True
	)

Setting ids to False seems to resolve the issue. However, this change may have implications on subsequent logic, requiring further investigation by the team.