default spikesnap to hovered data

Author: archmoj

src/plots/cartesian/layout_attributes.js

@@ -603,7 +603,7 @@ module.exports = {
     spikesnap: {
         valType: 'enumerated',
         values: ['data', 'cursor', 'hovered data'],
-        dflt: 'data',
+        dflt: 'hovered data',
         editType: 'none',
         description: 'Determines whether spikelines are stuck to the cursor or to the closest datapoints.'
     },

src/plots/cartesian/layout_defaults.js

@@ -253,7 +253,7 @@ module.exports = function supplyLayoutDefaults(layoutIn, layoutOut, fullData) {
         var spikethickness = coerce2('spikethickness', unifiedHover ? 1.5 : undefined);
         var spikedash = coerce2('spikedash', unifiedHover ? 'dot' : undefined);
         var spikemode = coerce2('spikemode', unifiedHover ? 'across' : undefined);
-        var spikesnap = coerce2('spikesnap', unifiedHover ? 'hovered data' : undefined);
+        var spikesnap = coerce2('spikesnap');
         var showSpikes = coerce('showspikes', !!unifiedSpike || !!spikecolor || !!spikethickness || !!spikedash || !!spikemode || !!spikesnap);
 
         if(!showSpikes) {