FIX: if regrid shape is passed, we should respect it and not use fast…

…-path

lib/cartopy/mpl/geoaxes.py

@@ -1281,7 +1281,8 @@ def imshow(self, img, *args, **kwargs):
                           y0 - eps <= extent[3] <= y1 + eps))
 
         if (transform is None or transform == self.transData or
-                same_projection and inside_bounds):
+                same_projection and inside_bounds and
+                kwargs.get("regrid_shape", None) is None):
             result = super().imshow(img, *args, **kwargs)
         else:
             extent = kwargs.pop('extent', None)

lib/cartopy/tests/mpl/test_images.py

@@ -139,6 +139,17 @@ def test_imshow_wrapping():
     assert ax.get_xlim() == (-180, 180)
 
 
+def test_imshow_arguments():
+    """Smoke test for imshow argument passing in the fast-path"""
+    ax = plt.axes(projection=ccrs.PlateCarree())
+    # Set the regrid_shape parameter to ensure it isn't passed to Axes.imshow()
+    # in the fast-path call to super()
+    ax.imshow(np.random.random((10, 10)), transform=ccrs.PlateCarree(),
+              extent=(-180, 180, -90, 90), regrid_shape=500)
+
+    assert ax.get_xlim() == (-180, 180)
+
+
 def test_imshow_rgba():
     # tests that the alpha of a RGBA array passed to imshow is set to 0
     # instead of masked