Bug summary

TkAgg reports bad option 'foobar' for icon with logging set to INFO level. The code in question is located here:

https://github.com/matplotlib/matplotlib/blob/d420e66c776becfcf489a0181acf5b777da9f9ea/lib/matplotlib/backends/_backend_tk.py

although I do not see where this foobar argument is coming from.

Code for reproduction

import matplotlib.pyplot as plt
import logging 
logging.basicConfig(level=logging.INFO, datefmt='%m-%d %H:%M')
import numpy as np
plt.switch_backend('TkAgg')
plt.figure()
plt.plot( np.arange(24), np.linspace(-np.pi,np.pi,24), '+-')
plt.show(block=True)

Actual outcome

INFO:matplotlib.backends._backend_tk:Could not load matplotlib icon: bad option "foobar": must be aspect, attributes, client, colormapwindows, command, deiconify, focusmodel, forget, frame, geometry, grid, group, iconbitmap, iconify, iconmask, iconname, iconphoto, iconposition, iconwindow, manage, maxsize, minsize, overrideredirect, positionfrom, protocol, resizable, sizefrom, stackorder, state, title, transient, or withdraw

Expected outcome

Nothing.

Matplotlib version

• Operating system: Windows 10
• Matplotlib version: 2.2.0
• Matplotlib backend (print(matplotlib.get_backend())): TkAgg
• Python version: 3.6.3 Anaconda
• Jupyter version (if applicable): N/A
• Other libraries: TkInter version 8.6

Installed via pip install yesterday.