server: Send WM_WINE_CLIPCURSOR message only when necessary.

server/queue.c

@@ -527,6 +527,7 @@ static void get_message_defaults( struct msg_queue *queue, int *x, int *y, unsig
 void set_clip_rectangle( struct desktop *desktop, const rectangle_t *rect, unsigned int flags, int reset )
 {
     rectangle_t top_rect;
+    unsigned int old_flags;
     int x, y;
 
     get_top_window_rectangle( desktop, &top_rect );
@@ -542,6 +543,9 @@ void set_clip_rectangle( struct desktop *desktop, const rectangle_t *rect, unsig
     }
     else desktop->cursor.clip = top_rect;
 
+    old_flags = desktop->cursor.clip_flags;
+    desktop->cursor.clip_flags = flags;
+
     /* warp the mouse to be inside the clip rect */
     x = max( min( desktop->cursor.x, desktop->cursor.clip.right - 1 ), desktop->cursor.clip.left );
     y = max( min( desktop->cursor.y, desktop->cursor.clip.bottom - 1 ), desktop->cursor.clip.top );
@@ -550,8 +554,9 @@ void set_clip_rectangle( struct desktop *desktop, const rectangle_t *rect, unsig
     /* request clip cursor rectangle reset to the desktop thread */
     if (reset) post_desktop_message( desktop, WM_WINE_CLIPCURSOR, flags, FALSE );
 
-    /* notify foreground thread, of reset, or to apply new cursor clipping rect */
-    queue_cursor_message( desktop, 0, WM_WINE_CLIPCURSOR, flags, reset );
+    /* notify foreground thread of reset, clipped, or released cursor rect */
+    if (reset || flags != SET_CURSOR_NOCLIP || old_flags != SET_CURSOR_NOCLIP)
+        queue_cursor_message( desktop, 0, WM_WINE_CLIPCURSOR, flags, reset );
 }
 
 /* change the foreground input and reset the cursor clip rect */

server/user.h

@@ -59,6 +59,7 @@ struct global_cursor
     int                  x;                /* cursor position */
     int                  y;
     rectangle_t          clip;             /* cursor clip rectangle */
+    unsigned int         clip_flags;       /* last cursor clip flags */
     unsigned int         last_change;      /* time of last position change */
     user_handle_t        win;              /* window that contains the cursor */
 };