separate heatmapgl supplyDefaults from heatmap

 - use heatmapgl attributes not heatmap
 - only coerce valid heatmapgl attributes not heatmap attributes

Author: archmoj

src/traces/heatmapgl/defaults.js

@@ -0,0 +1,33 @@
+/**
+* Copyright 2012-2020, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
+
+'use strict';
+
+var Lib = require('../../lib');
+
+var handleXYZDefaults = require('../heatmap/xyz_defaults');
+var colorscaleDefaults = require('../../components/colorscale/defaults');
+var attributes = require('./attributes');
+
+
+module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout) {
+    function coerce(attr, dflt) {
+        return Lib.coerce(traceIn, traceOut, attributes, attr, dflt);
+    }
+
+    var validData = handleXYZDefaults(traceIn, traceOut, coerce, layout);
+    if(!validData) {
+        traceOut.visible = false;
+        return;
+    }
+
+    coerce('text');
+
+    colorscaleDefaults(traceIn, traceOut, layout, coerce, {prefix: '', cLetter: 'z'});
+};

src/traces/heatmapgl/index.js

@@ -10,7 +10,7 @@
 
 module.exports = {
     attributes: require('./attributes'),
-    supplyDefaults: require('../heatmap/defaults'),
+    supplyDefaults: require('./defaults'),
     colorbar: require('../heatmap/colorbar'),
 
     calc: require('../heatmap/calc'),