Correctly re-order scatter3d face/edgecolors.

QuLogic · QuLogic · commit 5bd536bf56f4 · 2020-08-18T22:50:36.000-04:00
They should be re-ordered regardless of depth shading, but rather dependent on whether there's more than one colour. Fixes #18287.
diff --git a/lib/mpl_toolkits/mplot3d/art3d.py b/lib/mpl_toolkits/mplot3d/art3d.py
@@ -509,8 +509,9 @@ def do_3d_projection(self, renderer):
         vzs = vzs[z_markers_idx]
         vxs = vxs[z_markers_idx]
         vys = vys[z_markers_idx]
-        if self._depthshade:
+        if len(fcs) > 1:
             fcs = fcs[z_markers_idx]
+        if len(ecs) > 1:
             ecs = ecs[z_markers_idx]
         if len(sizes) > 1:
             sizes = sizes[z_markers_idx]
