Error about xticklabel in geoaxes

[heylsitan]

Description

I use labels=True in ax.format, although i set lonlim=(120,260), it return all the ticks along x axis.

Steps to reproduce

f,axs=plot.subplots(axwidth=10,proj='cyl',proj_kw={'lon_0': 180})
ax=axs[0]


for i in range(lon2.shape[1]):
    longitude=lon2[:,i]
    latitude=lat2[:,i]
    h=p2[1:,i]
    
    points = np.array([longitude, latitude]).T.reshape(-1, 1, 2)
    segments = np.concatenate([points[:-1], points[1:]], axis=1)

    norm = plt.Normalize(100, 800)

    lc = LineCollection(segments, cmap=cmaps.MPL_jet, norm=norm,transform=ccrs.PlateCarree())        
    lc.set_array(h)

    line = ax.add_collection(lc)    

tick=[-0.5,0.5]
m=ax.contour(flag,levels=tick,color='red',zorder=20)

ax.scatter(LHx2,LHy2,marker='x')

ax.format(title='1979-01-04:00',fontsize=15, land=True, landcolor='gray',latlim=(15,80),lonlim=(120,260),labels=True)
ax.colorbar(line,loc='bottom',label='unit(hPa)')

Expected behavior: [What you expected to happen]
only show the xticklabels in the lonlim.
Actual behavior: [What actually happened]
show the ticklabels outside of the lonlim

Equivalent steps in matplotlib

Please make sure this bug is related to a specific proplot feature. If you're not sure, try to replicate it with the native matplotlib API. Matplotlib bugs belong on the matplotlib github page.

# your code here, if applicable

Proplot version

0.50
Paste the result of import proplot; print(proplot.version) here.

[lukelbd]

This was a cartopy 0.17 bug. I've just added support for cartopy 0.18 in proplot (#158), so after the next version of proplot comes out (maybe a week), if you upgrade to cartopy 0.18 with e.g. conda install -c conda-forge cartopy=0.18 it should be fixed.

Normally in matplotlib when you set an axis locator to FixedLocator and the fixed tick locations extend outside of the axis bounds, matplotlib is supposed to not draw those ticks. However cartopy <=0.17 did not do this, so the FixedLocators created by proplot and assigned to the axes would draw ticks outside of the map limits. In cartopy 0.18 this appears to have been fixed.