use specs in fullLayout to compute the ordered categories,

- part one in fixing the category relayout bug
- by using the fullLayout (i.e. containerOur) specs, we ensure
  that ordered categories algo uses smartly-defaulted attributes.

Author: etpinard

src/plots/cartesian/axis_defaults.js

@@ -74,10 +74,6 @@ module.exports = function handleAxisDefaults(containerIn, containerOut, coerce,
         }
     }
 
-    containerOut._initialCategories = axType === 'category' ?
-        orderedCategories(letter, containerIn.categoryorder, containerIn.categoryarray, options.data) :
-        [];
-
     setConvert(containerOut);
 
     var dfltColor = coerce('color');
@@ -142,6 +138,11 @@ module.exports = function handleAxisDefaults(containerIn, containerOut, coerce,
         delete containerOut.zerolinewidth;
     }
 
+    // fill in categories
+    containerOut._initialCategories = axType === 'category' ?
+        orderedCategories(letter, containerOut.categoryorder, containerOut.categoryarray, options.data) :
+        [];
+
     return containerOut;
 };