add q1/median/q3 defaults + calc logic & tests

Author: etpinard

src/plots/cartesian/type_defaults.js

@@ -40,6 +40,7 @@ function setAutoType(ax, data) {
 
     var id = ax._id;
     var axLetter = id.charAt(0);
+    var i;
 
     // support 3d
     if(id.indexOf('scene') !== -1) id = axLetter;
@@ -50,15 +51,22 @@ function setAutoType(ax, data) {
     // first check for histograms, as the count direction
     // should always default to a linear axis
     if(d0.type === 'histogram' &&
-            axLetter === {v: 'y', h: 'x'}[d0.orientation || 'v']) {
+        axLetter === {v: 'y', h: 'x'}[d0.orientation || 'v']
+    ) {
         ax.type = 'linear';
         return;
     }
 
     var calAttr = axLetter + 'calendar';
     var calendar = d0[calAttr];
     var opts = {noMultiCategory: !traceIs(d0, 'cartesian') || traceIs(d0, 'noMultiCategory')};
-    var i;
+
+    // To not confuse 2D x/y used for per-box sample points for multicategory coordinates
+    if(d0.type === 'box' && d0._hasPreCompStats &&
+        axLetter === {h: 'x', v: 'y'}[d0.orientation || 'v']
+    ) {
+        opts.noMultiCategory = true;
+    }
 
     // check all boxes on this x axis to see
     // if they're dates, numbers, or categories