PR Summary

Closes #18520

import matplotlib.pyplot as plt
plt.text(0.1, 0.5, r"where $a = \sin(\phi) \text{ such that } \phi = \frac{x}{y}$")
plt.draw()

gives

However, the kerning is still from math, see

import matplotlib.pyplot as plt
plt.text(0.1, 0.5, r"where $a = \sin(\phi) \text{ where } \phi = \frac{x}{y}$")
plt.draw()

where the spacing between the e and the r in where differs.

However, it is not the case for e.g. r"where $\text{where}$" so not really clear to me why and where this happens.

Again, a bit doubtful (see #22171) if I can generate correct test images, so tests must be added.

It is not really clear how things will work with special symbols etc. Right now \{, \} and \$ can be dealt with, but one can probably break it if one tries (as for LaTeX itself).

PR Checklist

Tests and Styling

• Has pytest style unit tests (and pytest passes).
• Is Flake 8 compliant (install flake8-docstrings and run flake8 --docstring-convention=all).

Documentation

• [N/A] New features are documented, with examples if plot related.
• New features have an entry in doc/users/next_whats_new/ (follow instructions in README.rst there).
• [N/A] API changes documented in doc/api/next_api_changes/ (follow instructions in README.rst there).
• Documentation is sphinx and numpydoc compliant (the docs should build without error).