wxGTK: Fix improper wxEVT_LEAVE_WINDOW event

Do Not emit wxEVT_LEAVE_WINDOW when GdkEventCrossing mode is GDK_CROSSING_GRAB or GDK_CROSSING_GTK_GRAB

Author: 徐扬斌

src/gtk/window.cpp

@@ -2252,7 +2252,7 @@ gtk_window_leave_callback( GtkWidget*,
 
     // Event was emitted after an ungrab
     if (gdk_event->mode != GDK_CROSSING_NORMAL && gdk_event->mode != GDK_CROSSING_GRAB && gdk_event->mode != GDK_CROSSING_GTK_GRAB) return FALSE;
-
+	
     if ( win == g_windowUnderMouse )
         g_windowUnderMouse = NULL;