Fix auto zoom issue #3391 Zoom level gets reset at every second. (#3564)

* Add method to check if curr location marker is vsible or not

* Recenter map if users see their current location marker

* Add new methods to Contract

app/src/main/java/fr/free/nrw/commons/nearby/contract/NearbyParentFragmentContract.java

@@ -71,6 +71,9 @@ public interface NearbyParentFragmentContract {
         LatLng getLastLocation();
 
         com.mapbox.mapboxsdk.geometry.LatLng getLastFocusLocation();
+
+        boolean isCurrentLocationMarkerVisible();
+        void setProjectorLatLngBounds();
     }
 
     interface NearbyListView {

app/src/main/java/fr/free/nrw/commons/nearby/fragments/NearbyParentFragment.java

@@ -50,6 +50,7 @@ import com.mapbox.mapboxsdk.annotations.PolygonOptions;
 import com.mapbox.mapboxsdk.camera.CameraPosition;
 import com.mapbox.mapboxsdk.camera.CameraUpdateFactory;
 import com.mapbox.mapboxsdk.geometry.LatLng;
+import com.mapbox.mapboxsdk.geometry.LatLngBounds;
 import com.mapbox.mapboxsdk.maps.MapView;
 import com.mapbox.mapboxsdk.maps.MapboxMap;
 import com.mapbox.mapboxsdk.maps.Style;
@@ -201,6 +202,7 @@ public class NearbyParentFragment extends CommonsDaggerSupportFragment
     private boolean isVisibleToUser;
     private MapboxMap.OnCameraMoveListener cameraMoveListener;
     private fr.free.nrw.commons.location.LatLng lastFocusLocation;
+    private LatLngBounds latLngBounds;
 
 
     @Override
@@ -632,6 +634,22 @@ public class NearbyParentFragment extends CommonsDaggerSupportFragment
         return lastFocusLocation==null?null:LocationUtils.commonsLatLngToMapBoxLatLng(lastFocusLocation);
     }
 
+    @Override
+    public boolean isCurrentLocationMarkerVisible() {
+        if (latLngBounds == null) {
+            Timber.d("Map projection bounds are null");
+            return false;
+        } else {
+            Timber.d("Current location marker %s" , latLngBounds.contains(currentLocationMarker.getPosition()) ? "visible" : "invisible");
+            return latLngBounds.contains(currentLocationMarker.getPosition());
+        }
+    }
+
+    @Override
+    public void setProjectorLatLngBounds() {
+        latLngBounds = mapBox.getProjection().getVisibleRegion().latLngBounds;
+    }
+
     @Override
     public boolean isNetworkConnectionEstablished() {
         return NetworkUtils.isInternetConnectionEstablished(getActivity());
@@ -906,7 +924,6 @@ public class NearbyParentFragment extends CommonsDaggerSupportFragment
     }
 
     private void handleLocationUpdate(fr.free.nrw.commons.location.LatLng latLng, LocationServiceManager.LocationChangeType locationChangeType){
-        setMapBoxPosition(latLng);
         this.lastKnownLocation = latLng;
         NearbyController.currentLocation = lastKnownLocation;
         presenter.updateMapAndList(locationChangeType);
@@ -941,14 +958,6 @@ public class NearbyParentFragment extends CommonsDaggerSupportFragment
         }
     }
 
-    void setMapBoxPosition(fr.free.nrw.commons.location.LatLng latLng){
-        CameraPosition position = new CameraPosition.Builder()
-                .target(LocationUtils.commonsLatLngToMapBoxLatLng(latLng)) // Sets the new camera position
-                .zoom(ZOOM_LEVEL) // Same zoom level
-                .build();
-        mapBox.moveCamera(CameraUpdateFactory.newCameraPosition(position));
-    }
-
     public void backButtonClicked() {
         presenter.backButtonClicked();
     }

app/src/main/java/fr/free/nrw/commons/nearby/presenter/NearbyParentFragmentPresenter.java

@@ -8,8 +8,6 @@ import java.lang.reflect.Proxy;
 import java.util.HashMap;
 import java.util.List;
 
-import javax.inject.Inject;
-
 import fr.free.nrw.commons.bookmarks.locations.BookmarkLocationsDao;
 import fr.free.nrw.commons.kvstore.JsonKvStore;
 import fr.free.nrw.commons.location.LatLng;
@@ -21,9 +19,7 @@ import fr.free.nrw.commons.nearby.MarkerPlaceGroup;
 import fr.free.nrw.commons.nearby.NearbyBaseMarker;
 import fr.free.nrw.commons.nearby.NearbyController;
 import fr.free.nrw.commons.nearby.NearbyFilterState;
-import fr.free.nrw.commons.nearby.Place;
 import fr.free.nrw.commons.nearby.contract.NearbyParentFragmentContract;
-import fr.free.nrw.commons.upload.UploadContract;
 import fr.free.nrw.commons.utils.LocationUtils;
 import fr.free.nrw.commons.wikidata.WikidataEditListener;
 import timber.log.Timber;
@@ -194,7 +190,7 @@ public class NearbyParentFragmentPresenter
             nearbyParentFragmentView.populatePlaces(nearbyParentFragmentView.getCameraTarget());
         } else { // Means location changed slightly, ie user is walking or driving.
             Timber.d("Means location changed slightly");
-            if (!nearbyParentFragmentView.isSearchThisAreaButtonVisible()) { // Do not track users position if the user is checking around
+            if (nearbyParentFragmentView.isCurrentLocationMarkerVisible()){ // Means user wants to see their live location
                 nearbyParentFragmentView.recenterMap(curLatLng);
             }
         }
@@ -259,6 +255,7 @@ public class NearbyParentFragmentPresenter
 
     @Override
     public void onCameraMove(com.mapbox.mapboxsdk.geometry.LatLng latLng) {
+        nearbyParentFragmentView.setProjectorLatLngBounds();
             // If our nearby markers are calculated at least once
             if (NearbyController.latestSearchLocation != null) {
                double distance =latLng.distanceTo