Add preview stack

lib/redux/app/app_actions.dart

@@ -169,6 +169,8 @@ class PreviewEntity {
   final EntityType entityType;
 }
 
+class ClearPreviewStack {}
+
 class ClearData {}
 
 class RefreshDataFailure implements StopLoading {
@@ -257,6 +259,10 @@ void viewEntitiesByType({
           store.dispatch(ClearEntityFilter());
         }
 
+        if (uiState.previewStack.isNotEmpty) {
+          store.dispatch(ClearPreviewStack());
+        }
+
         switch (entityType) {
           case EntityType.dashboard:
             action = ViewDashboard(navigator: navigator);
@@ -382,6 +388,8 @@ void viewEntityById({
             entityType: entityType,
           ));
           return;
+        } else if (state.uiState.previewStack.isNotEmpty) {
+          store.dispatch(ClearPreviewStack());
         }
 
         if (filterEntity != null &&
@@ -598,6 +606,10 @@ void createEntityByType(
       context: context,
       force: force,
       callback: () {
+        if (state.uiState.previewStack.isNotEmpty) {
+          store.dispatch(ClearPreviewStack());
+        }
+
         switch (entityType) {
           case EntityType.client:
             store.dispatch(EditClient(
@@ -797,6 +809,10 @@ void createEntity({
           );
         }
 
+        if (uiState.previewStack.isNotEmpty) {
+          store.dispatch(ClearPreviewStack());
+        }
+
         switch (entity.entityType) {
           case EntityType.client:
             store.dispatch(EditClient(

lib/redux/ui/ui_reducer.dart

@@ -294,4 +294,8 @@ Reducer<BuiltList<EntityType>> previewStackReducer = combineReducers([
       action.entityType
     ]);
   }),
+  TypedReducer<BuiltList<EntityType>, ClearPreviewStack>(
+      (previewStack, action) {
+    return BuiltList(<EntityType>[]);
+  }),
 ]);