Geomap: Render one marker at duplicate coordinates (#106962)

* Geomap: Render one marker at duplicate coordinates

* Take into account all dims for uniqueness

* Simplify marker uniqueness key

public/app/plugins/panel/geomap/layers/data/markersLayer.tsx

@@ -22,7 +22,7 @@ import { MarkersLegend, MarkersLegendProps } from '../../components/MarkersLegen
 import { ObservablePropsWrapper } from '../../components/ObservablePropsWrapper';
 import { StyleEditor } from '../../editor/StyleEditor';
 import { getWebGLStyle, textMarker } from '../../style/markers';
-import { DEFAULT_SIZE, defaultStyleConfig, StyleConfig } from '../../style/types';
+import { DEFAULT_SIZE, defaultStyleConfig, StyleConfig, StyleConfigValues } from '../../style/types';
 import { getDisplacement, getRGBValues, getStyleConfigState, styleUsesText } from '../../style/utils';
 import { getStyleDimension } from '../../utils/utils';
 
@@ -122,12 +122,24 @@ export const markersLayer: MapLayerRegistryItem<MarkersConfig> = {
 
           // Track if we find any line strings during feature processing
           let hasLineString = false;
+          // Track coordinates to avoid rendering duplicate markers at the same location
+          const processedMarkers = new Set<string>();
+
+          // Helper function to create a robust uniqueness key
+          const createMarkerKey = (coordinates: number[], markerValues: StyleConfigValues): string => {
+            const coord = `${coordinates[0]},${coordinates[1]}`;
+            const { color, size, text, rotation } = markerValues;
+            return `markerAddressKey|${coord}|${color}|${size}|${text}|${rotation}`;
+          };
 
           source.forEachFeature((feature) => {
-            const isLineString = feature.getGeometry()?.getType() === 'LineString';
+            const geometry = feature.getGeometry();
+            const isLineString = geometry?.getType() === 'LineString';
+
             if (isLineString) {
               hasLineString = true;
             }
+
             const idx: number = feature.get('rowIndex');
             const dims = style.dims;
             const values = { ...style.base };
@@ -144,6 +156,25 @@ export const markersLayer: MapLayerRegistryItem<MarkersConfig> = {
             if (dims?.rotation) {
               values.rotation = dims.rotation.get(idx);
             }
+
+            // For point geometries, check if we've already processed this marker
+            if (geometry?.getType() === 'Point') {
+              const coordinates = geometry.getCoordinates();
+
+              // Skip this feature if coordinates are invalid
+              if (!coordinates || coordinates.length < 2) {
+                return;
+              }
+
+              const markerKey = createMarkerKey(coordinates, values);
+
+              // Skip this feature if we've already processed a marker with identical properties
+              if (processedMarkers.has(markerKey)) {
+                return;
+              }
+              processedMarkers.add(markerKey);
+            }
+
             if (!isLineString) {
               const colorString = tinycolor(theme.visualization.getColorByName(values.color)).toString();
               const colorValues = getRGBValues(colorString);