Add zindex for ohlc

Author: Farkites

src/traces/ohlc/attributes.js

@@ -133,4 +133,15 @@ module.exports = {
             ].join(' ')
         }
     }),
+
+    zindex: {
+        valType: 'integer',
+        dflt: 0,
+        editType: 'calc',
+        description: [
+            'Sets the layer on which this trace is displayed, relative to ',
+            'other traces on the same axes. Traces with higher `zindex` ',
+            'appear in front of those with lower `zindex`.'
+        ].join(' ')
+    }
 };

src/traces/ohlc/defaults.js

@@ -31,6 +31,8 @@ module.exports = function supplyDefaults(traceIn, traceOut, defaultColor, layout
     coerce('tickwidth');
 
     layout._requestRangeslider[traceOut.xaxis] = true;
+
+    coerce('zindex');
 };
 
 function handleDirection(traceIn, traceOut, coerce, direction) {

test/plot-schema.json

@@ -40531,6 +40531,12 @@
      "dflt": "",
      "editType": "none",
      "valType": "string"
+    },
+    "zindex": {
+     "description": "Sets the layer on which this trace is displayed, relative to  other traces on the same axes. Traces with higher `zindex`  appear in front of those with lower `zindex`.",
+     "dflt": 0,
+     "editType": "calc",
+     "valType": "integer"
     }
    },
    "categories": [