bring back scene.update + 🔒 down its used during drag

Author: etpinard

src/traces/scattergl/index.js

@@ -486,6 +486,22 @@ function sceneUpdate(gd, subplot) {
     if(!subplot._scene) {
         scene = subplot._scene = Lib.extendFlat({}, reset, first);
 
+        // apply new option to all regl components (used on drag)
+        scene.update = function update(opt) {
+            var opts = new Array(scene.count);
+            for(var i = 0; i < scene.count; i++) {
+                opts[i] = opt;
+            }
+
+            if(scene.fill2d) scene.fill2d.update(opts);
+            if(scene.scatter2d) scene.scatter2d.update(opts);
+            if(scene.line2d) scene.line2d.update(opts);
+            if(scene.error2d) scene.error2d.update(opts.concat(opts));
+            if(scene.select2d) scene.select2d.update(opts);
+
+            scene.draw();
+        };
+
         // draw traces in proper order
         scene.draw = function draw() {
             var i;

test/jasmine/tests/gl2d_plot_interact_test.js

@@ -282,10 +282,16 @@ describe('@gl Test gl2d plots', function() {
             gd.on('plotly_relayout', relayoutCallback);
         })
         .then(function() {
+            var scene = gd._fullLayout._plots.xy._scene;
+            spyOn(scene, 'draw');
+
             // Drag scene along the X axis
             return mouseTo([200, 200], [220, 200]);
         })
         .then(function() {
+            var scene = gd._fullLayout._plots.xy._scene;
+            expect(scene.draw).toHaveBeenCalledTimes(3);
+
             expect(gd.layout.xaxis.autorange).toBe(false);
             expect(gd.layout.yaxis.autorange).toBe(false);
             expect(gd.layout.xaxis.range).toBeCloseToArray(newX, precision);