Fixes Issue #4734 : HotKeys trigger command when control is disabled

src/Avalonia.Controls/HotkeyManager.cs

@@ -22,7 +22,7 @@ namespace Avalonia.Controls
 
             private ICommand GetCommand() => CommandSource.Command;
 
-            public bool CanExecute(object parameter) => GetCommand()?.CanExecute(parameter) ?? false;
+            public bool CanExecute(object parameter) => CommandSource.IsEffectivelyEnabled;
 
             public void Execute(object parameter) => GetCommand()?.Execute(parameter);
 

src/Avalonia.Input/ICommandSource.cs

@@ -27,5 +27,10 @@ namespace Avalonia.Input
         /// <param name="sender"></param>
         /// <param name="e"></param>
         void CanExecuteChanged(object sender, System.EventArgs e);
+
+        /// <summary>
+        /// Gets a value indicating whether this control and all its parents are enabled.
+        /// </summary>
+        bool IsEffectivelyEnabled { get; }
     }
 }