Remove GlobalHotkey, use LowLevelHotkey

Extend the custom hotkey handling to support this use case. This change
has the effect that even system-registered hotkeys can be used from
FancyWM, with the FancyWM hotkeys taking precedence.

Author: veselink1

FancyWM.Tests/Utilities/GlobalHotkeyTest.cs

@@ -79,7 +79,7 @@ public partial class MainWindow : Window, IDisposable
         private bool m_showFocusDuringAction;
         private bool m_autoCollapse;
         private bool m_notifyVirtualDesktopServiceIncompatibility;
-        private GlobalHotkey[] m_directHks = [];
+        private LowLevelHotkey[] m_directHks = [];
 
 #pragma warning disable CS8618 // Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
         public MainWindow()
@@ -387,17 +387,21 @@ private void RebindDirectHotkeys(KeybindingDictionary keybindings)
                 hk.Dispose();
             }
 
-            var newHotkeys = new List<GlobalHotkey>();
+            var newHotkeys = new List<LowLevelHotkey>();
             var failedHotkeys = new List<Keybinding>();
             foreach (var x in keybindings
                 .Where(x => x.Value?.IsDirectMode == true))
             {
                 try
                 {
                     var (modifiers, key) = KeyCodeHelper.GetModifierAndKeyCode(x.Value!.Keys);
-                    var hk = new GlobalHotkey(m_hwnd, modifiers, key);
+                    var hk = new LowLevelHotkey(m_llkbdHook, modifiers, key)
+                    {
+                        HideKeyPress = true,
+                        ScanOnRelease = false,
+                        ClearModifiersOnMiss = false,
+                    };
                     hk.Pressed += delegate { OnDirectHotkeyPressed(x.Key); };
-                    hk.Register();
                     newHotkeys.Add(hk);
                 }
                 catch (Win32Exception)

FancyWM/MainWindow.xaml.cs

@@ -15,6 +15,7 @@ internal class LowLevelHotkey : IDisposable
         public KeyCode Key { get; }
         public bool ScanOnRelease { get; init; } = false;
         public bool HideKeyPress { get; init; } = true;
+        public bool ClearModifiersOnMiss { get; init; } = false;
 
         private readonly KeyCode[] m_modifiers;
         private readonly bool[] m_pressedModifiers;
@@ -62,7 +63,7 @@ bool Scan(ref LowLevelKeyboardHook.KeyStateChangedEventArgs e)
                 {
                     m_pressedModifiers[modifierIndex] = true;
                 }
-                else if (e.KeyCode != Key)
+                else if (e.KeyCode != Key && ClearModifiersOnMiss)
                 {
                     // A non-modifier, non-main key was pressed, in which case
                     // we reset the state, to allow other hotkeys to trigger.