star (*) symbol in text box cuts off bottom of text when saved #15313

Bug report

Bug summary

When using the star (*) symbol in a text box, it cuts off the bottom of the text when saved (savefig). This is only the case when usetex=False in rcParams.

Code for reproduction

import matplotlib
import matplotlib.pyplot as plt

from matplotlib import rc
rc('text', usetex=False)

fig, ax = plt.subplots(1,1)
ax.text(0.5, 0.5, '$S_{*} M^{ath}$ and some not math',
         transform=ax.transAxes)
plt.savefig('test1.png', bbox_inches='tight')

You can see the bottom of the text box is cut off. Whereas this plots fine:

fig, ax = plt.subplots(1,1)
ax.text(0.5, 0.5, '$S_{ome} M^{ath}$ and some not math',
         transform=ax.transAxes)
plt.savefig('test1.png', bbox_inches='tight')

Matplotlib version

• Operating system: Unix
• Matplotlib version: 3.1.1
• Matplotlib backend (print(matplotlib.get_backend())): TkAgg
• Python version: Python 3.6.8 (default, Apr 25 2019, 21:02:35)

matplotlib installed from pip

• Other libraries:

cycler==0.10.0
kiwisolver==1.1.0
numpy==1.17.2
pyparsing==2.4.2
python-dateutil==2.8.0
six==1.12.0