Fixed wrong state in GTK Entry using Placeholder and Text (#2915) fixes #2810

Xamarin.Forms.Platform.GTK/Controls/EntryWrapper.cs

@@ -99,7 +99,6 @@ namespace Xamarin.Forms.Platform.GTK.Controls
         {
             if (string.IsNullOrEmpty(_entry.Text) && !string.IsNullOrEmpty(_placeholder.Text))
             {
-                Entry.Sensitive = false;
                 _placeholderContainer.GdkWindow?.Raise();
             }
             else

Xamarin.Forms.Platform.GTK/FormsWindow.cs

@@ -126,7 +126,7 @@ namespace Xamarin.Forms.Platform.GTK
 			}
 		}
 
-		private async void OnWindowStateEvent (object o, WindowStateEventArgs args)
+		private void OnWindowStateEvent (object o, WindowStateEventArgs args)
 		{
 			if (args.Event.ChangedMask == Gdk.WindowState.Iconified) {
 				var windowState = args.Event.NewWindowState;