Disable keyboard controller input while swkbd is open (foreground) (second attempt) (#6808)

* Block input updates while swkbd is open in foreground mode

* Flush internal driver state before unblocking input updates

* Rename Flush to Clear and remove unnecessary attribute

* Clear the driver state only if the GamepadDriver isn't null

src/Ryujinx/Input/AvaloniaKeyboard.cs

@@ -195,7 +195,7 @@ namespace Ryujinx.Ava.Input
 
         public void Clear()
         {
-            _driver?.ResetKeys();
+            _driver?.Clear();
         }
 
         public void Dispose() { }

src/Ryujinx/Input/AvaloniaKeyboardDriver.cs

@@ -94,7 +94,7 @@ namespace Ryujinx.Ava.Input
             return _pressedKeys.Contains(nativeKey);
         }
 
-        public void ResetKeys()
+        public void Clear()
         {
             _pressedKeys.Clear();
         }

src/Ryujinx/UI/Applet/AvaHostUIHandler.cs

@@ -122,6 +122,7 @@ namespace Ryujinx.Ava.UI.Applet
             {
                 try
                 {
+                    _parent.ViewModel.AppHost.NpadManager.BlockInputUpdates();
                     var response = await SwkbdAppletDialog.ShowInputDialog(LocaleManager.Instance[LocaleKeys.SoftwareKeyboard], args);
 
                     if (response.Result == UserResult.Ok)
@@ -143,6 +144,7 @@ namespace Ryujinx.Ava.UI.Applet
             });
 
             dialogCloseEvent.WaitOne();
+            _parent.ViewModel.AppHost.NpadManager.UnblockInputUpdates();
 
             userText = error ? null : inputText;