Incorrect behavior of GridLiner when setting draw_labels='x'

[jshn9515]

Description

I attempted to create a NorthPolarStereo projection where only the x-axis label is visible. However, when I set draw_labels='x', both the x and y-axis labels are displayed. Under closer inspection, I discovered that the logic for determining whether to draw the label is unclear. Within the GridLliner class, when auto_inline=True, self.inline_labels is always set to the specific coordinate, regardless of the draw_labels setting. This result causes in incorrect behavior to _draw_this_label function.

Code to reproduce

import numpy as np
import cartopy.crs as ccrs
import cartopy.feature as cfeature
import matplotlib.pyplot as plt
import matplotlib.path as mpath

fig = plt.figure(1)
ax = fig.add_subplot(projection=ccrs.NorthPolarStereo())
ax.set_extent([-180, 180, 0, 90], crs=ccrs.PlateCarree())
ax.add_feature(cfeature.LAND.with_scale('110m'))
theta = np.linspace(0, 2 * np.pi, 100)
center = [0.5, 0.5]
radius = 0.5
verts = np.vstack([np.sin(theta), np.cos(theta)]).T
circle = mpath.Path(verts * radius + center)
ax.set_boundary(circle, transform=ax.transAxes)
ax.gridlines(draw_labels='x', xlocs=np.arange(-180, 210, 30), rotate_labels=False,
             ylocs=np.arange(0, 90, 20), linestyle=':', color='black')
plt.show()

Cartopy version

0.23.0

This is the display figure