bugfix: on clear region when ieeg is been shown

src/ui/regionalFeatures/regionFeature.base.ts

 import { Input, SimpleChanges } from "@angular/core"
-import { BehaviorSubject } from "rxjs"
+import { BehaviorSubject, of } from "rxjs"
 import { IFeature, RegionalFeaturesService } from "./regionalFeature.service"
 
 export class RegionFeatureBase{
@@ -29,7 +29,11 @@ export class RegionFeatureBase{
     if (changes.region && changes.region.previousValue !== changes.region.currentValue) {
       this.isLoading = true
       this.features = []
-      this._regionalFeatureService.getAllFeaturesByRegion(changes.region.currentValue).pipe(
+      
+      const _ = (changes.region.currentValue
+        ? this._regionalFeatureService.getAllFeaturesByRegion(changes.region.currentValue)
+        : of([])
+      ).pipe(
 
       ).subscribe({
         next: features => this.features = features,

src/ui/viewerStateController/viewerState.useEffect.ts

@@ -7,11 +7,12 @@ import { CHANGE_NAVIGATION, FETCHED_TEMPLATE, IavRootStoreInterface, NEWVIEWER,
 import { VIEWERSTATE_CONTROLLER_ACTION_TYPES } from "./viewerState.base";
 import { TemplateCoordinatesTransformation } from "src/services/templateCoordinatesTransformation.service";
 import { CLEAR_STANDALONE_VOLUMES } from "src/services/state/viewerState.store";
-import { viewerStateToggleRegionSelect, viewerStateHelperSelectParcellationWithId, viewerStateSelectTemplateWithId, viewerStateNavigateToRegion, viewerStateSelectedTemplateSelector, viewerStateFetchedTemplatesSelector, viewerStateNewViewer, viewerStateSelectedParcellationSelector, viewerStateNavigationStateSelector, viewerStateSelectTemplateWithName } from "src/services/state/viewerState.store.helper";
+import { viewerStateToggleRegionSelect, viewerStateHelperSelectParcellationWithId, viewerStateSelectTemplateWithId, viewerStateNavigateToRegion, viewerStateSelectedTemplateSelector, viewerStateFetchedTemplatesSelector, viewerStateNewViewer, viewerStateSelectedParcellationSelector, viewerStateNavigationStateSelector, viewerStateSelectTemplateWithName, viewerStateSelectedRegionsSelector } from "src/services/state/viewerState.store.helper";
 import { ngViewerSelectorClearViewEntries } from "src/services/state/ngViewerState/selectors";
 import { ngViewerActionClearView } from "src/services/state/ngViewerState/actions";
 import { PureContantService } from "src/util";
 import { verifyPositionArg } from 'common/util'
+import { uiActionHideAllDatasets } from "src/services/state/uiState/actions";
 
 const defaultPerspectiveZoom = 1e6
 const defaultZoom = 1e6
@@ -114,6 +115,18 @@ export class ViewerStateControllerUseEffect implements OnDestroy {
     }),
   )
 
+  /**
+   * on clear of region selected, also clear selected dataset ids
+   */
+  @Effect()
+  public clearShownDatasetIdOnRegionClear: Observable<any> = this.store$.pipe(
+    select(viewerStateSelectedRegionsSelector),
+    filter(r => r.length === 0),
+    mapTo(
+      uiActionHideAllDatasets()
+    )
+  )
+
   @Effect()
   public selectParcellation$: Observable<any>