Bug report

Bug summary

Specifying edges=open and including colors through cellColours will result in a table without any colors.

Code for reproduction

fig, ax = plt.subplots(dpi=300)

ax.axis('off')
ax.axis('tight')

even_color='#9CDEF6'
odd_color='#6549DA'

cell_text = [[0.2] * 3, [0.1] * 3, [0.3] * 3]

labels=['Linear Regression', 'Bayesian Ridge', 'MARS']
columns = ['$R^2$', 'MAE', 'RMSE']

cell_colors = [[even_color] * len(columns) if i % 2 == 0 else [odd_color] * len(columns) for i in range(len(cell_text))]

table = ax.table(cellText=cell_text,
                      rowLabels=labels,
                      cellColours = cell_colors,
                      colLabels=columns,
                      loc='best', edges='open', cellLoc='center')

Actual outcome

Expected outcome

Cell colors should be applied to cells even if the table cell edges are set to open. Like the table below, but without the ugly cell lines.

Matplotlib version

• Operating system:
• Matplotlib version (import matplotlib; print(matplotlib.__version__)): 3.3.3
• Matplotlib backend (print(matplotlib.get_backend())): module://ipykernel.pylab.backend_inline
• Python version: 3.9.4
• Jupyter version (if applicable): core-4.7.0, notebook-6.2.0
• Other libraries:

Installed through pip.