Bug report

Bug summary

Mathtext operators (\log, \max, etc.) should insert a thin space after themselves (if followed by ordinary characters, not if followed by an open parenthesis, see https://tex.stackexchange.com/questions/225922/spacing-rules-for-operatorname/225924#225924), but currently it does not.

Code for reproduction

from pylab import *
figtext(.5, .6, r"$\log 6$ (usetex)", usetex=True)
figtext(.5, .5, r"$\log 6$ (current)")
figtext(.5, .4, r"$\mathdefault{log}\,6$ (manual thin space)")
figtext(.5, .3, r"$\mathdefault{log}\ 6$ (manual full space)")
show()

Actual outcome

Note the missing thin space between "g" and "6" in the current behavior.

Matplotlib version

• Operating system: fedora
• Matplotlib version: master
• Matplotlib backend (print(matplotlib.get_backend())): qt5agg
• Python version: 38
• Jupyter version (if applicable):
• Other libraries: