make sure arrayOk resyle logic works for hoverlabel attributes

- and all (future) plots/attributes.js declarations.

Author: etpinard

src/plot_api/plot_api.js

@@ -1608,7 +1608,9 @@ function _restyle(gd, aobj, _traces) {
             }
             else {
                 var moduleAttrs = (contFull._module || {}).attributes || {};
-                var valObject = Lib.nestedProperty(moduleAttrs, ai).get() || {};
+                var valObject = Lib.nestedProperty(moduleAttrs, ai).get() ||
+                    Lib.nestedProperty(Plots.attributes, ai).get() ||
+                    {};
 
                 // if restyling entire attribute container, assume worse case
                 if(!valObject.valType) {

test/jasmine/tests/plot_api_test.js

@@ -254,7 +254,7 @@ describe('Test plot api', function() {
         });
     });
 
-    describe('Plotly.restyle', function() {
+    describe('Plotly.restyle subroutines switchboard', function() {
         beforeEach(function() {
             spyOn(PlotlyInternal, 'plot');
             spyOn(Plots, 'previousPromises');
@@ -330,6 +330,36 @@ describe('Test plot api', function() {
             expect(PlotlyInternal.plot).toHaveBeenCalled();
         });
 
+        it('should do full replot when arrayOk base attributes are updated', function() {
+            var gd = {
+                data: [{x: [1, 2, 3], y: [1, 2, 3]}],
+                layout: {}
+            };
+
+            mockDefaultsAndCalc(gd);
+            Plotly.restyle(gd, 'hoverlabel.bgcolor', [['red', 'green', 'blue']]);
+            expect(gd.calcdata).toBeUndefined();
+            expect(PlotlyInternal.plot).toHaveBeenCalled();
+
+            mockDefaultsAndCalc(gd);
+            PlotlyInternal.plot.calls.reset();
+            Plotly.restyle(gd, 'hoverlabel.bgcolor', 'yellow');
+            expect(gd.calcdata).toBeUndefined();
+            expect(PlotlyInternal.plot).toHaveBeenCalled();
+
+            mockDefaultsAndCalc(gd);
+            PlotlyInternal.plot.calls.reset();
+            Plotly.restyle(gd, 'hoverlabel.bgcolor', 'blue');
+            expect(gd.calcdata).toBeDefined();
+            expect(PlotlyInternal.plot).not.toHaveBeenCalled();
+
+            mockDefaultsAndCalc(gd);
+            PlotlyInternal.plot.calls.reset();
+            Plotly.restyle(gd, 'hoverlabel.bgcolor', [['red', 'blue', 'green']]);
+            expect(gd.calcdata).toBeUndefined();
+            expect(PlotlyInternal.plot).toHaveBeenCalled();
+        });
+
         it('should do full replot when attribute container are updated', function() {
             var gd = {
                 data: [{x: [1, 2, 3], y: [1, 2, 3]}],