add single option

Author: archmoj

Diff for: src/components/fx/hover.js

@@ -291,7 +291,7 @@ function _hover(gd, evt, subplot, noHoverEvent, eventTarget) {
     }
 
     // list of all overlaid subplots to look at
-    if(plotinfo) {
+    if(plotinfo && hoversubplots !== 'single') {
         var overlayedSubplots = plotinfo.overlays.map(function(pi) {
             return pi.id;
         });

Diff for: src/components/fx/layout_attributes.js

@@ -80,11 +80,12 @@ module.exports = {
     },
     hoversubplots: {
         valType: 'enumerated',
-        values: ['overlaying', 'axis'],
+        values: ['single', 'overlaying', 'axis'],
         dflt: 'overlaying',
         editType: 'none',
         description: [
             'Determines expansion of hover effects to other subplots',
+            'If *single* just the axis pair of the primary point is included without overlaying subplots.',
             'If *overlaying* all subplots using the main axis and occupying the same space are included.',
             'If *axis*, also include stacked subplots using the same axis',
             'when `hovermode` is set to *x*, *x unified*, *y* or *y unified*.',

Diff for: test/plot-schema.json

@@ -2635,11 +2635,12 @@
     ]
    },
    "hoversubplots": {
-    "description": "Determines expansion of hover effects to other subplots If *overlaying* all subplots using the main axis and occupying the same space are included. If *axis*, also include stacked subplots using the same axis when `hovermode` is set to *x*, *x unified*, *y* or *y unified*.",
+    "description": "Determines expansion of hover effects to other subplots If *single* just the axis pair of the primary point is included without overlaying subplots. If *overlaying* all subplots using the main axis and occupying the same space are included. If *axis*, also include stacked subplots using the same axis when `hovermode` is set to *x*, *x unified*, *y* or *y unified*.",
     "dflt": "overlaying",
     "editType": "none",
     "valType": "enumerated",
     "values": [
+     "single",
      "overlaying",
      "axis"
     ]