when adding new repos via Intents, clean out Activities from the Task

app/src/main/java/org/fdroid/fdroid/views/ManageReposActivity.java

@@ -271,6 +271,9 @@ public class ManageReposActivity extends AppCompatActivity
                         @Override
                         public void onClick(DialogInterface dialog, int which) {
                             dialog.dismiss();
+                            if (isImportingRepo) {
+                                ManageReposActivity.this.finish();
+                            }
                         }
                     });
 

app/src/main/java/org/fdroid/fdroid/views/main/MainActivity.java

@@ -345,8 +345,10 @@ public class MainActivity extends AppCompatActivity implements BottomNavigationB
                 } else {
                     startActivity(new Intent(ACTION_ADD_REPO, intent.getData(), this, ManageReposActivity.class));
                 }
+                finish();
             } else if (parser.getErrorMessage() != null) {
                 Toast.makeText(this, parser.getErrorMessage(), Toast.LENGTH_LONG).show();
+                finish();
             }
         }
     }