do not attempt to re-hover on exiting mapbox subplots

Author: etpinard

src/plots/mapbox/mapbox.js

@@ -475,7 +475,7 @@ proto.initFx = function(calcData, fullLayout) {
         self.yaxis.p2c = function() { return evt.lngLat.lat; };
 
         gd._fullLayout._rehover = function() {
-            if(gd._fullLayout._hoversubplot === self.id) {
+            if(gd._fullLayout._hoversubplot === self.id && gd._fullLayout[self.id]) {
                 Fx.hover(gd, evt, self.id);
             }
         };

test/jasmine/tests/mapbox_test.js

@@ -1,5 +1,6 @@
 var Plotly = require('@lib');
 var Lib = require('@src/lib');
+var Fx = require('@src/components/fx');
 
 var constants = require('@src/plots/mapbox/constants');
 var supplyLayoutDefaults = require('@src/plots/mapbox/layout_defaults');
@@ -1155,6 +1156,38 @@ describe('@noCI, mapbox plots', function() {
         .then(done);
     }, LONG_TIMEOUT_INTERVAL);
 
+    it('@gl should not attempt to rehover over exiting subplots', function(done) {
+        spyOn(Fx, 'hover').and.callThrough();
+
+        function countHoverLabels() {
+            return d3.select('.hoverlayer').selectAll('g').size();
+        }
+
+        Promise.resolve()
+        .then(function() {
+            return _mouseEvent('mousemove', pointPos, function() {
+                expect(countHoverLabels()).toEqual(1);
+                expect(Fx.hover).toHaveBeenCalledTimes(1);
+                expect(Fx.hover.calls.argsFor(0)[2]).toBe('mapbox');
+                Fx.hover.calls.reset();
+            });
+        })
+        .then(function() { return Plotly.deleteTraces(gd, [0, 1]); })
+        .then(delay(10))
+        .then(function() {
+            return _mouseEvent('mousemove', pointPos, function() {
+                expect(countHoverLabels()).toEqual(0);
+                // N.B. no additional calls from Plots.rehover()
+                // (as 'mapbox' subplot is gone),
+                // just one on the fallback xy subplot
+                expect(Fx.hover).toHaveBeenCalledTimes(1);
+                expect(Fx.hover.calls.argsFor(0)[2]).toBe('xy');
+            });
+        })
+        .catch(failTest)
+        .then(done);
+    }, LONG_TIMEOUT_INTERVAL);
+
     it('@gl should respond drag / scroll / double-click interactions', function(done) {
         var relayoutCnt = 0;
         var doubleClickCnt = 0;