fix #2722 - get the right traces in hist calc for cross-trace coupling

Author: alexcjohnson

src/traces/histogram/calc.js

@@ -23,7 +23,7 @@ var oneMonth = require('../../constants/numerical').ONEAVGMONTH;
 var getBinSpanLabelRound = require('./bin_label_vals');
 
 module.exports = function calc(gd, trace) {
-    // ignore as much processing as possible (and including in autorange) if bar is not visible
+    // ignore as much processing as possible (and including in autorange) if not visible
     if(trace.visible !== true) return;
 
     // depending on orientation, set position and size axes and data ranges
@@ -435,6 +435,7 @@ function getConnectedHistograms(gd, trace) {
     for(var i = 0; i < fullData.length; i++) {
         var tracei = fullData[i];
         if(tracei.type === 'histogram' &&
+            tracei.visible === true &&
             tracei.orientation === orientation &&
             tracei.xaxis === xid && tracei.yaxis === yid
         ) {

test/jasmine/tests/histogram_test.js

@@ -11,6 +11,7 @@ var getBinSpanLabelRound = require('@src/traces/histogram/bin_label_vals');
 var createGraphDiv = require('../assets/create_graph_div');
 var destroyGraphDiv = require('../assets/destroy_graph_div');
 var supplyAllDefaults = require('../assets/supply_defaults');
+var failTest = require('../assets/fail_test');
 
 
 describe('Test histogram', function() {
@@ -690,7 +691,7 @@ describe('Test histogram', function() {
                     expect(trace._autoBinFinished).toBeUndefined(i);
                 });
             })
-            .catch(fail)
+            .catch(failTest)
             .then(done);
         });
 
@@ -703,7 +704,42 @@ describe('Test histogram', function() {
             .then(function() {
                 expect(gd._fullLayout.xaxis.range).toBeCloseToArray([2, 4], 3);
             })
-            .catch(fail)
+            .catch(failTest)
+            .then(done);
+        });
+
+        it('can recalc after the first trace is hidden', function(done) {
+            function assertTraceCount(n) {
+                expect(gd.querySelectorAll('.trace').length).toBe(n);
+            }
+
+            Plotly.newPlot(gd, [{
+                x: [1, 2, 3], type: 'histogram'
+            }, {
+                x: [1, 2, 3], type: 'histogram'
+            }, {
+                x: [1, 2, 3], type: 'histogram'
+            }])
+            .then(function() {
+                assertTraceCount(3);
+                return Plotly.restyle(gd, 'visible', 'legendonly');
+            })
+            .then(function() {
+                assertTraceCount(0);
+                return Plotly.restyle(gd, 'visible', true, [1]);
+            })
+            .then(function() {
+                assertTraceCount(1);
+                return Plotly.restyle(gd, 'visible', true, [2]);
+            })
+            .then(function() {
+                assertTraceCount(2);
+                return Plotly.restyle(gd, 'visible', true);
+            })
+            .then(function() {
+                assertTraceCount(3);
+            })
+            .catch(failTest)
             .then(done);
         });
     });