Bug summary

When there are more than 7 sub figures per row, the line between points will be invisible for the last several subfigs.

Code for reproduction

import matplotlib.pyplot as plt

subfig_size = (16, 9)

num_subfigs = 10
fig, axes = plt.subplots(1, num_subfigs, figsize=(num_subfigs * subfig_size[0], 1 * subfig_size[1]), dpi=300)
for j in range(num_subfigs):
    xs = list(range(10))
    ax = axes[j]
    
    ax.plot(xs, xs, marker='x', label=f"test", linewidth=3, markersize=10)

plt.savefig('test.jpg')

Actual outcome

Expected outcome

Line should be visible!

Additional information

What are the conditions under which this bug happens? input parameters, edge cases, etc?

• matplotlib==3.9.2
  Has this worked in earlier versions?
• Tried 3.5.0, but still not works

Operating system

Ubuntu

Matplotlib Version

3.9.2

Matplotlib Backend

qtagg

Python version

3.10.9

Jupyter version

6.5.2

Installation

pip