Fix the issue with not being able to switch back to the original keyboard layout in OnDeactivated

Author: Yusyuriv

Flow.Launcher.Infrastructure/NativeMethods.txt

@@ -51,4 +51,9 @@ WM_EXITSIZEMOVE
 GetKeyboardLayout
 GetWindowThreadProcessId
 ActivateKeyboardLayout
-GetKeyboardLayoutList
+GetKeyboardLayoutList
+
+PostMessage
+HWND_BROADCAST
+WM_INPUTLANGCHANGEREQUEST
+INPUTLANGCHANGE_FORWARD

Flow.Launcher.Infrastructure/Win32Helper.cs

@@ -403,7 +403,11 @@ public static void RestorePreviousKeyboardLayout()
         {
             if (_previousLayout == HKL.Null) return;
 
-            PInvoke.ActivateKeyboardLayout(_previousLayout, 0);
+            PInvoke.PostMessage(HWND.HWND_BROADCAST,
+                PInvoke.WM_INPUTLANGCHANGEREQUEST,
+                PInvoke.INPUTLANGCHANGE_FORWARD,
+                _previousLayout.Value
+            );
             _previousLayout = HKL.Null;
         }