Merged QuickLook.Common from submodule

https://github.com/QL-Win/QuickLook.Common/commit/529d07b56577b88329481cdac8f2a6a175b6c21a

QuickLook.Common/Commands/AsyncRelayCommand.cs

@@ -0,0 +1,59 @@
+// Copyright © 2017-2026 QL-Win Contributors
+//
+// This file is part of QuickLook program.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace QuickLook.Common.Commands;
+
+public class AsyncRelayCommand(Func<Task> execute, Func<bool> canExecute = null) : ICommand
+{
+    private readonly Func<Task> _execute = execute ?? throw new ArgumentNullException(nameof(execute));
+    private readonly Func<bool> _canExecute = canExecute ?? (() => true);
+    private bool _isExecuting;
+
+    public bool CanExecute(object parameter)
+    {
+        return !_isExecuting && _canExecute();
+    }
+
+    public async void Execute(object parameter)
+    {
+        if (!CanExecute(parameter))
+            return;
+
+        _isExecuting = true;
+        RaiseCanExecuteChanged();
+        try
+        {
+            await _execute();
+        }
+        finally
+        {
+            _isExecuting = false;
+            RaiseCanExecuteChanged();
+        }
+    }
+
+    public event EventHandler CanExecuteChanged;
+
+    public void RaiseCanExecuteChanged()
+    {
+        CanExecuteChanged?.Invoke(this, EventArgs.Empty);
+    }
+}