perf(map): analyze only the selected theme

backend/tests/test_sprint237_flanders_thematic_on_demand.py

@@ -34,7 +34,8 @@ def test_selection_reads_and_bounded_acquires_all_relevant_themes() -> None:
     app = read("frontend/src/App.tsx")
     selection_hook = read("frontend/src/hooks/useMapThemeSelectionInsights.ts")
 
-    assert "for (const theme of DATA_THEMES)" in workspace
+    assert "for (const theme of [activeTheme])" in workspace
+    assert "loadSelectedThemeResult" in workspace
     assert "? onDemandProductsForZones(resolvedZones)" in workspace
     assert ".filter((product) => product.theme === activeThemeId)" not in workspace
     assert "await loadThemeInsights(bbox, availableThemes, areaId)" in workspace

frontend/src/components/map/MapWorkspace.tsx

@@ -1791,7 +1791,7 @@ export function MapWorkspace({
     })
   }
 
-  const loadAllThemeResults = async (bbox: VectorSelectionBBox, areaId?: string) => {
+  const loadSelectedThemeResult = async (bbox: VectorSelectionBBox, areaId?: string) => {
     let resolvedZones = selectedCoverageZones
     const scale = selectionAnalysisScale(bbox)
     if (analysisMode === 'current' && selectedProjectId) {
@@ -1852,7 +1852,7 @@ export function MapWorkspace({
     }
     const availableThemes: Array<MapThemeQuery<DataThemeId>> = []
     const resultFeatureLimit = selectionFeatureLimit(bbox)
-    for (const theme of DATA_THEMES) {
+    for (const theme of [activeTheme]) {
       const dataset = themeDatasetMap[theme.id]
       const partitioned = Boolean(
         dataset
@@ -1904,7 +1904,7 @@ export function MapWorkspace({
     setMapAnalysisDurationMs(null)
     setSelectionBbox(bbox)
     const tasks: Array<Promise<unknown>> = analysisMode === 'current'
-      ? [loadAllThemeResults(bbox, areaId)]
+      ? [loadSelectedThemeResult(bbox, areaId)]
       : []
     const activeDatasetSupportsSelection = !activeThemeDataset
       || persistedDatasetSupportsSelection(activeThemeDataset, bbox)
@@ -2576,7 +2576,7 @@ export function MapWorkspace({
             ) : mapSelectionLoading || themeResultsLoading || temporalComparisonLoading ? (
               <div className="geo-results-loading" role="status">
                 <span />
-                <strong>Officiële bronnen worden begrensd geladen en geanalyseerd…</strong>
+                <strong>De gekozen officiële bron wordt begrensd geladen en geanalyseerd…</strong>
               </div>
             ) : (
               <>