feat(legacy-plugin-chart-map-box): show all points in mapbox chart

plugins/legacy-plugin-chart-map-box/src/MapBox.jsx

@@ -108,7 +108,15 @@ class MapBox extends React.Component {
     // Compute the clusters based on the original bounds and current zoom level. Note when zoom/pan
     // to an area outside of the original bounds, no additional queries are made to the backend to
     // retrieve additional data.
-    const bbox = [bounds[0][0], bounds[0][1], bounds[1][0], bounds[1][1]];
+    // add this variable to widen the visible area
+    const offsetHorizontal = (width * 0.5) / 100;
+    const offsetVertical = (height * 0.5) / 100;
+    const bbox = [
+      bounds[0][0] - offsetHorizontal,
+      bounds[0][1] - offsetVertical,
+      bounds[1][0] + offsetHorizontal,
+      bounds[1][1] + offsetVertical,
+    ];
     const clusters = clusterer.getClusters(bbox, Math.round(viewport.zoom));
 
     return (