Fix System.OperationCanceledException Issue (#3091)

Author: Jack251970

Plugins/Flow.Launcher.Plugin.Program/Main.cs

@@ -60,15 +60,26 @@ public async Task<List<Result>> QueryAsync(Query query, CancellationToken token)
             var result = await cache.GetOrCreateAsync(query.Search, async entry =>
             {
                 var resultList = await Task.Run(() =>
-                    _win32s.Cast<IProgram>()
-                        .Concat(_uwps)
-                        .AsParallel()
-                        .WithCancellation(token)
-                        .Where(HideUninstallersFilter)
-                        .Where(p => p.Enabled)
-                        .Select(p => p.Result(query.Search, Context.API))
-                        .Where(r => r?.Score > 0)
-                        .ToList());
+                {
+                    try
+                    {
+                        return _win32s.Cast<IProgram>()
+                            .Concat(_uwps)
+                            .AsParallel()
+                            .WithCancellation(token)
+                            .Where(HideUninstallersFilter)
+                            .Where(p => p.Enabled)
+                            .Select(p => p.Result(query.Search, Context.API))
+                            .Where(r => r?.Score > 0)
+                            .ToList();
+                    }
+                    catch (OperationCanceledException)
+                    {
+                        // Fix #3091: System.OperationCanceledException Issue
+                        return emptyResults;
+                    }
+                   
+                });
 
                 resultList = resultList.Any() ? resultList : emptyResults;