Revert all changes as master branch

Author: Jack251970

Flow.Launcher/ViewModel/MainViewModel.cs

@@ -1266,17 +1266,20 @@ private async Task QueryResultsAsync(bool searchDelay, bool isReQuery = false, b
 
             var isHomeQuery = query.RawQuery == string.Empty;
 
-            _updateSource?.Dispose(); // Dispose old update source to fix possible cancellation issue
-            _updateSource = new CancellationTokenSource();
-            _updateToken = _updateSource.Token;
+            _updateSource?.Dispose();
+
+            var currentUpdateSource = new CancellationTokenSource();
+            _updateSource = currentUpdateSource;
+            var currentCancellationToken = _updateSource.Token;
+            _updateToken = currentCancellationToken;
 
             ProgressBarVisibility = Visibility.Hidden;
             _isQueryRunning = true;
 
             // Switch to ThreadPool thread
             await TaskScheduler.Default;
 
-            if (_updateToken.IsCancellationRequested) return;
+            if (currentCancellationToken.IsCancellationRequested) return;
 
             // Update the query's IsReQuery property to true if this is a re-query
             query.IsReQuery = isReQuery;
@@ -1325,19 +1328,19 @@ private async Task QueryResultsAsync(bool searchDelay, bool isReQuery = false, b
             {
                 // Wait 15 millisecond for query change in global query
                 // if query changes, return so that it won't be calculated
-                await Task.Delay(15, _updateToken);
-                if (_updateToken.IsCancellationRequested) return;
+                await Task.Delay(15, currentCancellationToken);
+                if (currentCancellationToken.IsCancellationRequested) return;
             }*/
 
-            _ = Task.Delay(200, _updateToken).ContinueWith(_ =>
+            _ = Task.Delay(200, currentCancellationToken).ContinueWith(_ =>
                 {
                     // start the progress bar if query takes more than 200 ms and this is the current running query and it didn't finish yet
                     if (_isQueryRunning)
                     {
                         ProgressBarVisibility = Visibility.Visible;
                     }
                 },
-                _updateToken,
+                currentCancellationToken,
                 TaskContinuationOptions.NotOnCanceled,
                 TaskScheduler.Default);
 
@@ -1348,21 +1351,21 @@ private async Task QueryResultsAsync(bool searchDelay, bool isReQuery = false, b
             {
                 tasks = plugins.Select(plugin => plugin.Metadata.HomeDisabled switch
                 {
-                    false => QueryTaskAsync(plugin, _updateToken),
+                    false => QueryTaskAsync(plugin, currentCancellationToken),
                     true => Task.CompletedTask
                 }).ToArray();
 
                 // Query history results for home page firstly so it will be put on top of the results
                 if (Settings.ShowHistoryResultsForHomePage)
                 {
-                    QueryHistoryTask();
+                    QueryHistoryTask(currentCancellationToken);
                 }
             }
             else
             {
                 tasks = plugins.Select(plugin => plugin.Metadata.Disabled switch
                 {
-                    false => QueryTaskAsync(plugin, _updateToken),
+                    false => QueryTaskAsync(plugin, currentCancellationToken),
                     true => Task.CompletedTask
                 }).ToArray();
             }
@@ -1377,13 +1380,13 @@ private async Task QueryResultsAsync(bool searchDelay, bool isReQuery = false, b
                 // nothing to do here
             }
 
-            if (_updateToken.IsCancellationRequested) return;
+            if (currentCancellationToken.IsCancellationRequested) return;
 
             // this should happen once after all queries are done so progress bar should continue
             // until the end of all querying
             _isQueryRunning = false;
 
-            if (!_updateToken.IsCancellationRequested)
+            if (!currentCancellationToken.IsCancellationRequested)
             {
                 // update to hidden if this is still the current query
                 ProgressBarVisibility = Visibility.Hidden;
@@ -1443,19 +1446,19 @@ await PluginManager.QueryHomeForPluginAsync(plugin, query, token) :
                 }
             }
 
-            void QueryHistoryTask()
+            void QueryHistoryTask(CancellationToken token)
             {
                 // Select last history results and revert its order to make sure last history results are on top
                 var historyItems = _history.Items.TakeLast(Settings.MaxHistoryResultsToShowForHomePage).Reverse();
 
                 var results = GetHistoryItems(historyItems);
 
-                if (_updateToken.IsCancellationRequested) return;
+                if (token.IsCancellationRequested) return;
 
                 App.API.LogDebug(ClassName, $"Update results for history");
 
                 if (!_resultsUpdateChannelWriter.TryWrite(new ResultsForUpdate(results, _historyMetadata, query,
-                    _updateToken)))
+                    token)))
                 {
                     App.API.LogError(ClassName, "Unable to add item to Result Update Queue");
                 }