Multiple problems involving `ax.axhline` with mplcyberpunk

[diceroll123]

Consider the following code:

plt.style.use("cyberpunk")
ax = plt.gca()

ax.axhline(y=1, color="#C20000")  # draw a red line across the X axis, y=1
ax.step(range(7), [0, 1, 2, 3, 2, 1, 0], marker="o")
mplcyberpunk.add_glow_effects()

plt.show()

The area filled in with red underneath the blue is inconsistent, showing where x <= 1, I'd expect to see it at x >= 5 here.

That wasn't even why I started writing the issue, I found it while making my test case to showcase the error I found -- but I figured I'd bring it up.

---

The initial reason I was making an issue was because using ax.axhline with mplcyberpunk.add_glow_effects(gradient_fill=True) throws an AttributeError.

plt.style.use("cyberpunk")
ax = plt.gca()

ax.axhline(y=1, color="#C20000")  # draw a red line across the X axis, y=1
ax.step(range(7), [0, 1, 2, 3, 2, 1, 0], marker="o")
mplcyberpunk.add_glow_effects(gradient_fill=True) # this is the only line changed from the above example

plt.show()

Traceback:

Traceback (most recent call last):
  File "test.py", line 17, in <module>
    main()
  File "test.py", line 12, in main
    mplcyberpunk.add_glow_effects(gradient_fill=True)
  File ".../mplcyberpunk/core.py", line 18, in add_glow_effects
    add_gradient_fill(ax=ax)
  File ".../mplcyberpunk/core.py", line 126, in add_gradient_fill
    xmin, xmax = x.min(), x.max()
AttributeError: 'list' object has no attribute 'min'

This is because the line is a list of tuples, rather than a numpy array.

The tests for mplcyberpunk could be more strict I suppose.

[dhaitz]

thanks for reporting this, should be fixed in the latest version!