allow template input in Lib.coerce2 - fix issue 4852

 - set axes tickcolor, tickwidth & tiklen via template

Author: archmoj

src/lib/coerce.js

@@ -412,6 +412,15 @@ exports.coerce2 = function(containerIn, containerOut, attributes, attribute, dfl
     var propOut = exports.coerce(containerIn, containerOut, attributes, attribute, dflt);
     var valIn = propIn.get();
 
+    var attr = attributes[attribute];
+    var theDefault = (dflt !== undefined) ? dflt : (attr || {}).dflt;
+    if(
+        theDefault !== undefined &&
+        theDefault !== propOut
+    ) {
+        return propOut;
+    }
+
     return (valIn !== undefined && valIn !== null) ? propOut : false;
 };
 

test/image/mocks/axes_custom-ticks_log-date.json

@@ -15,44 +15,48 @@
     "layout": {
         "width": 500,
         "height": 300,
-        "title": {
-            "text": "custom ticks on date & log axes"
-        },
-        "paper_bgcolor": "lightblue",
-        "plot_bgcolor": "#ddd",
-        "yaxis": {
-            "type": "log",
-            "tickmode": "array",
-            "tickvals": [
-                1,
-                10,
-                100
-            ],
-            "ticktext": [
-                "one",
-                "ten",
-                "one<br>hundred"
-            ],
-            "gridwidth": 2,
-            "tickwidth": 15,
-            "tickcolor": "green",
-            "gridcolor": "green"
-        },
-        "xaxis": {
-            "type": "date",
-            "tickmode": "array",
-            "tickvals": [
-                "2010-01-16",
-                "2010-02-14"
-            ],
-            "ticktext": [
-                "Jan 16",
-                "Feb 14"
-            ],
-            "gridwidth": 10,
-            "tickwidth": 50,
-            "tickcolor": "rgba(255,0,0,0.75)",
-            "gridcolor": "rgba(255,0,0,0.25)"
+        "template": {
+            "layout": {
+                "title": {
+                    "text": "custom ticks on date & log axes"
+                },
+                "paper_bgcolor": "lightblue",
+                "plot_bgcolor": "#ddd",
+                "yaxis": {
+                    "type": "log",
+                    "tickmode": "array",
+                    "tickvals": [
+                        1,
+                        10,
+                        100
+                    ],
+                    "ticktext": [
+                        "one",
+                        "ten",
+                        "one<br>hundred"
+                    ],
+                    "gridwidth": 2,
+                    "tickwidth": 15,
+                    "tickcolor": "green",
+                    "gridcolor": "green"
+                },
+                "xaxis": {
+                    "type": "date",
+                    "tickmode": "array",
+                    "tickvals": [
+                        "2010-01-16",
+                        "2010-02-14"
+                    ],
+                    "ticktext": [
+                        "Jan 16",
+                        "Feb 14"
+                    ],
+                    "gridwidth": 10,
+                    "tickwidth": 50,
+                    "tickcolor": "rgba(255,0,0,0.75)",
+                    "gridcolor": "rgba(255,0,0,0.25)"
+                }
+            }
         }
     }
 }