fix multiple single-valued overlaid autobinned traces case

Author: etpinard

src/traces/histogram/calc.js

@@ -398,11 +398,12 @@ function calcAllAutoBins(gd, trace, pa, mainData, _overlayEdgeCase) {
  * Returns the binSpec for the trace that sparked all this
  */
 function handleSingleValueOverlays(gd, trace, pa, mainData, binAttr) {
+    var fullLayout = gd._fullLayout;
     var overlaidTraceGroup = getConnectedHistograms(gd, trace);
     var pastThisTrace = false;
     var minSize = Infinity;
     var singleValuedTraces = [trace];
-    var i, tracei;
+    var i, tracei, binOpts;
 
     // first collect all the:
     // - min bin size from all multi-valued traces
@@ -456,11 +457,16 @@ function handleSingleValueOverlays(gd, trace, pa, mainData, binAttr) {
         tracei = singleValuedTraces[i];
         var calendar = tracei[mainData + 'calendar'];
 
-        tracei._input[binAttr] = tracei[binAttr] = {
+        var newBins = {
             start: pa.c2r(dataVals[i] - minSize / 2, 0, calendar),
             end: pa.c2r(dataVals[i] + minSize / 2, 0, calendar),
             size: minSize
         };
+
+        tracei._input[binAttr] = tracei[binAttr] = newBins;
+
+        binOpts = fullLayout._histogramBinOpts[tracei['_' + mainData + 'bingroup']];
+        if(binOpts) Lib.extendFlat(binOpts, newBins);
     }
 
     return trace[binAttr];

test/jasmine/tests/histogram_test.js

@@ -693,6 +693,14 @@ describe('Test histogram', function() {
             ]);
         });
 
+        it('handles multiple single-valued overlaid autobinned traces', function() {
+            var out = _calc({x: [1]}, [{x: [1]}], {barmode: 'overlay'}, true);
+
+            expect(out).toEqual([
+                {p: 1, s: 1, b: 0, pts: [0], ph1: 1, ph0: 1, width1: 1, i: 0}
+            ]);
+        });
+
         it('handles multiple single-valued overlaid autobinned traces with different values', function() {
             var out = _calc({x: [null, 13, '', 13]}, [
                 {x: [5]},