spikeline: handle spikedistance set to -1 separately

Author: antoinerg

src/components/fx/hover.js

@@ -549,7 +549,7 @@ function _hover(gd, evt, subplot, noHoverEvent) {
         var thisSpikeDistance;
         for(var i = 0; i < pointsData.length; i++) {
             thisSpikeDistance = pointsData[i].spikeDistance;
-            if(thisSpikeDistance <= minDistance && thisSpikeDistance <= spikedistance) {
+            if(spikedistance === Infinity || (thisSpikeDistance < minDistance && thisSpikeDistance <= spikedistance)) {
                 resultPoint = pointsData[i];
                 minDistance = thisSpikeDistance;
             }