Bug report

If I use an "L" configuration for the ImageGrid label_mode, then the offset text on axes still appears for all axes, even though the tick labels themselves are not present. The "L" mode should disable the offset text where appropriate.

Code for reproduction

import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid1 import ImageGrid
import numpy as np

im1 = np.arange(100).reshape((10, 10))
im2 = im1.T
im3 = np.flipud(im1)
im4 = np.fliplr(im2)

fig = plt.figure(figsize=(4., 4.))
grid = ImageGrid(fig, 111,  # similar to subplot(111)
                 nrows_ncols=(2, 2),  # creates 2x2 grid of axes
                 label_mode="L",
                 axes_pad=0.2,  # pad between axes in inch.
                 )

for ax, im in zip(grid, [im1, im2, im3, im4]):
    # Iterating over the grid returns the Axes.
    ax.imshow(im, extent=[0, 1.e8, 0, 1.e8])

plt.savefig("test.png")

Actual outcome

# If applicable, paste the console output here
#
#

Expected outcome

The 10^8 offset text on the x-axis of the upper left axes, the x- and y- on the upper right, and the y on the lower right should not be display.

Matplotlib version

• Operating system: Fedora 31
• Matplotlib version: 3.2.1
• Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg
• Python version: 3.7.6
• Jupyter version (if applicable): N/A
• Other libraries:

matplotlib installed via pip