fix multiple time snackbar open after press

Author: amitamrutiya

lib/Components/RSSFeedHomePage.dart

@@ -636,6 +636,7 @@ class _RSSFeedHomePageState extends State<RSSFeedHomePage>
                                                         'New Feed added successfully',
                                                         'Dismiss');
 
+                                                ScaffoldMessenger.of(context).clearSnackBars();
                                                 ScaffoldMessenger.of(context)
                                                     .showSnackBar(
                                                         addFeedSnackbar);
@@ -2037,7 +2038,7 @@ class _RSSFeedHomePageState extends State<RSSFeedHomePage>
                                                             .information,
                                                         'New Rule added successfully',
                                                         'Dismiss');
-
+                                                ScaffoldMessenger.of(context).clearSnackBars();
                                                 ScaffoldMessenger.of(context)
                                                     .showSnackBar(
                                                         addRuleSnackbar);

lib/Components/add_torrent_sheet.dart

@@ -278,7 +278,7 @@ class _AddTorrentSheetState extends State<AddTorrentSheet> {
                       SnackbarType.information,
                       'Torrent added successfully',
                       'Dismiss');
-
+                  ScaffoldMessenger.of(context).clearSnackBars();
                   ScaffoldMessenger.of(context)
                       .showSnackBar(addTorrentSnackbar);
                 },

lib/Components/delete_torrent_sheet.dart

@@ -118,6 +118,7 @@ class _DeleteTorrentSheetState extends State<DeleteTorrentSheet> {
                           SnackbarType.caution,
                           'Torrent deleted successfuly',
                           'Dismiss');
+                      ScaffoldMessenger.of(context).clearSnackBars();
                       ScaffoldMessenger.of(context)
                           .showSnackBar(deleteTorrentSnackBar);
                     },

lib/Pages/settings_screen.dart

@@ -197,7 +197,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
 
               final changeSettingsSnackBar = addFloodSnackBar(
                   SnackbarType.success, 'Settings changed', 'Dismiss');
-
+              ScaffoldMessenger.of(context).clearSnackBars();
               ScaffoldMessenger.of(context)
                   .showSnackBar(changeSettingsSnackBar);
             },
@@ -772,7 +772,7 @@ class AuthenticationSection extends StatelessWidget {
                         );
                         final addNewUserSnackBar = addFloodSnackBar(
                             SnackbarType.success, 'New user added', 'Dismiss');
-
+                        ScaffoldMessenger.of(context).clearSnackBars();
                         ScaffoldMessenger.of(context)
                             .showSnackBar(addNewUserSnackBar);
                       },