Bug summary

Using a high horizontal ruler overwrites denominator

Code for reproduction

import matplotlib.pyplot as plt
plt.text(0.5, 0.5, r'$\genfrac{}{}{10}{}{foo}{bar}$')
plt.draw()

Actual outcome

Expected outcome

This is from LaTeX rendering, but actually not that good either. It seems like the distance is also scaled with the height of the bar.

Additional information

Using

        vlist = Vlist([cnum,                      # numerator
                       Vbox(0, thickness * 2.0),  # space
                       Hrule(state, rule),        # rule
                       Vbox(0, thickness * 2.0 + 2 * rule),  # space
                       cden                       # denominator
                       ])

in _genfrac (that is, adding 2 * rule to the second spacer) gives

Which I guess it at least somewhat consistent and no overwrite. The question is if one can/want to do better?

I can include this is #22171 if it seems like a reasonable solution.

Operating system

Windows 10

Matplotlib Version

3.6.0.dev1270+g46d2a1e.d20220109

Matplotlib Backend

module://matplotlib_inline.backend_inline

Python version

3.9.9

Jupyter version

No response

Installation

git checkout