Merge pull request matplotlib#2 from tacaswell/mec_alpha

FIX: respect alpha on alt face color

Author: efiring

lib/matplotlib/lines.py

@@ -755,7 +755,7 @@ def draw(self, renderer):
                 gc.set_linewidth(self._markeredgewidth)
                 mec = self._markeredgecolor
                 if (is_string_like(mec) and mec == 'auto' and
-                    rgbaFace is not None):
+                        rgbaFace is not None):
                     gc.set_alpha(rgbaFace[3])
                 else:
                     gc.set_alpha(self.get_alpha())
@@ -794,6 +794,11 @@ def draw(self, renderer):
                 if alt_marker_path:
                     alt_marker_trans = marker.get_alt_transform()
                     alt_marker_trans = alt_marker_trans.scale(w)
+                    if (is_string_like(mec) and mec == 'auto' and
+                            rgbaFaceAlt is not None):
+                        gc.set_alpha(rgbaFaceAlt[3])
+                    else:
+                        gc.set_alpha(self.get_alpha())
 
                     renderer.draw_markers(
                             gc, alt_marker_path, alt_marker_trans, subsampled,