server: Make layered windows transparent for mouse messages.

server/queue.c

@@ -1252,7 +1252,7 @@ static user_handle_t find_hardware_message_window( struct thread_input *input, s
     {
         if (!input || !(win = input->capture))
         {
-            if (!(win = msg->win) || !is_window_visible( win ))
+            if (!(win = msg->win) || !is_window_visible( win ) || is_window_transparent( win ))
             {
                 if (input) win = window_from_point( input->desktop, data->x, data->y );
             }

server/user.h

@@ -135,6 +135,7 @@ extern void destroy_thread_windows( struct thread *thread );
 extern int is_child_window( user_handle_t parent, user_handle_t child );
 extern int is_top_level_window( user_handle_t window );
 extern int is_window_visible( user_handle_t window );
+extern int is_window_transparent( user_handle_t window );
 extern int make_window_active( user_handle_t window );
 extern struct thread *get_window_thread( user_handle_t handle );
 extern user_handle_t window_from_point( struct desktop *desktop, int x, int y );

server/window.c

@@ -602,6 +602,13 @@ int is_window_visible( user_handle_t window )
     return is_visible( win );
 }
 
+int is_window_transparent( user_handle_t window )
+{
+    struct window *win = get_user_object( window, USER_WINDOW );
+    if (!win) return 0;
+    return (win->ex_style & (WS_EX_LAYERED|WS_EX_TRANSPARENT)) == (WS_EX_LAYERED|WS_EX_TRANSPARENT);
+}
+
 /* check if point is inside the window */
 static inline int is_point_in_window( struct window *win, int x, int y )
 {