Add metacalculation on currentview

assets/themes/grb_import/grb.json

@@ -29,6 +29,37 @@
     "minzoom": 19
   },
   "layers": [
+    {
+      "builtin": "current_view",
+      "override": {
+        "+mapRendering": [
+          {
+            "location": ["point"],
+            "icon": {
+              "render": "./assets/themes/grb_import/robot.svg"
+            },
+            "iconSize": "15,15,center"
+          }
+        ],
+        "calculatedTags": [
+          "_x='y'",
+          "_embedded_crab_addresses=feat.overlapWith('crab_address').length"
+        ],
+        "tagRenderings": [
+          {
+            "id": "hw",
+            "render": "There are {_embedded_crab_addresses} adresses in view",
+            "mappings": [{
+              "if": "_embedded_crab_addresses=",
+              "then": "Loading..."
+            },{
+              "if": "_embedded_crab_addresses=0",
+              "then": "No CRAB addresses in view. Zoom in more to see them"
+            }]
+          }
+        ]
+      }
+    },
     {
       "builtin": "type_node",
       "override": {

assets/themes/grb_import/license_info.json

@@ -6,5 +6,15 @@
       "Pieter Vander Vennet"
     ],
     "sources": []
+  },
+  {
+    "path": "robot.svg",
+    "license": "CC-BY 4.0 International",
+    "authors": [
+      "Font Awesome"
+    ],
+    "sources": [
+      "https://commons.wikimedia.org/wiki/File:Font_Awesome_5_solid_robot.svg"
+    ]
   }
 ]

assets/themes/grb_import/robot.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 640 512"><path d="M0 256v128c0 17.7 14.3 32 32 32h32V224H32c-17.7 0-32 14.3-32 32zM464 96H352V32c0-17.7-14.3-32-32-32s-32 14.3-32 32v64H176c-44.2 0-80 35.8-80 80v272c0 35.3 28.7 64 64 64h320c35.3 0 64-28.7 64-64V176c0-44.2-35.8-80-80-80zM256 416h-64v-32h64v32zm-32-120c-22.1 0-40-17.9-40-40s17.9-40 40-40 40 17.9 40 40-17.9 40-40 40zm128 120h-64v-32h64v32zm96 0h-64v-32h64v32zm-32-120c-22.1 0-40-17.9-40-40s17.9-40 40-40 40 17.9 40 40-17.9 40-40 40zm192-72h-32v192h32c17.7 0 32-14.3 32-32V256c0-17.7-14.3-32-32-32z"/></svg>
+<!--
+Font Awesome Free 5.2.0 by @fontawesome - https://fontawesome.com
+License - https://fontawesome.com/license (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License)
+-->