axhline/axvline don't use prop_cycle #14222
Description
Hi matplotlib developers,
axhline and axvline do not use the prop_cycle, and it seems to me that they should. Was this intentional?
import numpy as np
import matplotlib.pyplot as plt
from cycler import cycler
fig, ax = plt.subplots()
ax.set_prop_cycle(cycler(color=['r', 'g', 'y', 'm'], ls=['--']*4))
ax.plot(np.arange(9))
ax.axhline(4) # uses default styles instead of cycler
ax.axvline(4) # uses default styles instead of cycler
ax.plot(-np.arange(9))
plt.show()Tested with matplotlib 3.0.3 and python 3.7.3 (Anaconda) on Windows 10.