fix issue 3871 - pie-like legend with line color array

Author: archmoj

src/lib/index.js

@@ -634,7 +634,6 @@ lib.getTargetArray = function(trace, transformOpts) {
 lib.minExtend = function(obj1, obj2) {
     var objOut = {};
     if(typeof obj2 !== 'object') obj2 = {};
-    var arrayLen = 3;
     var keys = Object.keys(obj1);
     var i, k, v;
 
@@ -644,11 +643,7 @@ lib.minExtend = function(obj1, obj2) {
         if(k.charAt(0) === '_' || typeof v === 'function') continue;
         else if(k === 'module') objOut[k] = v;
         else if(Array.isArray(v)) {
-            if(k === 'colorscale') {
-                objOut[k] = v.slice();
-            } else {
-                objOut[k] = v.slice(0, arrayLen);
-            }
+            objOut[k] = v.slice();
         } else if(v && (typeof v === 'object')) objOut[k] = lib.minExtend(obj1[k], obj2[k]);
         else objOut[k] = v;
     }

test/image/baselines/pie_legend_line_color_array.png

@@ -0,0 +1,41 @@
+{
+    "data": [
+        {
+            "type": "pie",
+            "labels": [
+                "a",
+                "b",
+                "c",
+                "yellow"
+            ],
+            "values": [
+                1,
+                3,
+                5,
+                7
+            ],
+            "marker": {
+                "colors": [
+                    "pink",
+                    "lightgreen",
+                    "skyblue",
+                    "orange"
+                ],
+                "line": {
+                    "width": 5,
+                    "color": [
+                        "red",
+                        "green",
+                        "blue",
+                        "yellow"
+                    ]
+                }
+            }
+        }
+    ],
+    "layout": {
+        "width": 400,
+        "height": 400,
+        "title": { "text": "pie-like legend with line.color array of length > 3" }
+    }
+}