[mob] Add support for removing people to cluster mapping

mobile/lib/face/db.dart

@@ -368,6 +368,17 @@ class FaceMLDataDB {
     await batch.commit(noResult: true);
   }
 
+  Future<void> removePerson(String personID) async {
+    final db = await instance.database;
+    await db.delete(
+      clusterPersonTable,
+      where: '$personIdColumn = ?',
+      whereArgs: [personID],
+    );
+    await db.delete(notPersonFeedback,
+        where: '$personIdColumn = ?', whereArgs: [personID]);
+  }
+
   /// Returns a map of faceID to record of clusterId and faceEmbeddingBlob
   ///
   /// Only selects faces with score greater than [minScore] and blur score greater than [minClarity]

mobile/lib/services/machine_learning/face_ml/person/person_service.dart

@@ -1,5 +1,7 @@
 import "dart:convert";
 
+import "package:photos/core/event_bus.dart";
+import "package:photos/events/people_changed_event.dart";
 import "package:photos/face/db.dart";
 import "package:photos/face/model/person.dart";
 import "package:photos/models/api/entity/type.dart";
@@ -84,6 +86,29 @@ class PersonService {
     return PersonEntity(result.id, data);
   }
 
+  Future<void> deletePerson(String personID, {bool onlyMapping = true}) async {
+    if (onlyMapping) {
+      final PersonEntity? entity = await getPerson(personID);
+      if (entity == null) {
+        return;
+      }
+      final PersonEntity justName =
+          PersonEntity(personID, PersonData(name: entity.data.name));
+      await entityService.addOrUpdate(
+        EntityType.person,
+        json.encode(justName.data.toJson()),
+        id: personID,
+      );
+      await faceMLDataDB.removePerson(personID);
+    } else {
+      await entityService.deleteEntry(personID);
+      await faceMLDataDB.removePerson(personID);
+    }
+
+    // fire PeopleChangeEvent
+    Bus.instance.fire(PeopleChangedEvent());
+  }
+
   Future<void> storeRemoteFeedback() async {
     await entityService.syncEntities();
     final entities = await entityService.getEntities(EntityType.person);

mobile/lib/ui/viewer/people/people_app_bar.dart

@@ -39,6 +39,7 @@ class PeopleAppBar extends StatefulWidget {
 enum PeoplPopupAction {
   rename,
   setCover,
+  remove,
   viewPhotos,
   confirmPhotos,
   hide,
@@ -164,18 +165,19 @@ class _AppBarWidgetState extends State<PeopleAppBar> {
         //     ],
         //   ),
         // ),
-        // PopupMenuItem(
-        //   value: PeoplPopupAction.rename,
-        //   child: Row(
-        //     children: [
-        //       const Icon(Icons.visibility_off),
-        //       const Padding(
-        //         padding: EdgeInsets.all(8),
-        //       ),
-        //       Text(S.of(context).hide),
-        //     ],
-        //   ),
-        // ),
+
+        PopupMenuItem(
+          value: PeoplPopupAction.remove,
+          child: Row(
+            children: [
+              const Icon(Icons.remove_circle_outline),
+              const Padding(
+                padding: EdgeInsets.all(8),
+              ),
+              Text(S.of(context).remove),
+            ],
+          ),
+        ),
         const PopupMenuItem(
           value: PeoplPopupAction.viewPhotos,
           child: Row(
@@ -235,6 +237,8 @@ class _AppBarWidgetState extends State<PeopleAppBar> {
               await setCoverPhoto(context);
             } else if (value == PeoplPopupAction.hide) {
               // ignore: unawaited_futures
+            } else if (value == PeoplPopupAction.remove) {
+              await PersonService.instance.deletePerson(widget.person.remoteID);
             }
           },
         ),