win32u: Add a separate function to process WM_WINE_CLIPCURSOR.

dlls/win32u/input.c

@@ -2497,6 +2497,18 @@ BOOL get_clip_cursor( RECT *rect )
     return ret;
 }
 
+BOOL process_wine_clipcursor( BOOL empty )
+{
+    RECT rect;
+
+    TRACE( "empty %u\n", empty );
+
+    if (empty) return user_driver->pClipCursor( NULL );
+
+    get_clip_cursor( &rect );
+    return user_driver->pClipCursor( &rect );
+}
+
 /***********************************************************************
  *       NtUserClipCursor (win32u.@)
  */

dlls/win32u/message.c

@@ -1272,13 +1272,7 @@ static LRESULT handle_internal_message( HWND hwnd, UINT msg, WPARAM wparam, LPAR
         return call_current_hook( h_extra->handle, HC_ACTION, wparam, h_extra->lparam );
     }
     case WM_WINE_CLIPCURSOR:
-        if (wparam)
-        {
-            RECT rect;
-            get_clip_cursor( &rect );
-            return user_driver->pClipCursor( &rect );
-        }
-        return user_driver->pClipCursor( NULL );
+        return process_wine_clipcursor( !wparam );
     case WM_WINE_UPDATEWINDOWSTATE:
         update_window_state( hwnd );
         return 0;

dlls/win32u/win32u_private.h

@@ -101,6 +101,7 @@ extern BOOL set_foreground_window( HWND hwnd, BOOL mouse ) DECLSPEC_HIDDEN;
 extern void toggle_caret( HWND hwnd ) DECLSPEC_HIDDEN;
 extern void update_mouse_tracking_info( HWND hwnd ) DECLSPEC_HIDDEN;
 extern BOOL get_clip_cursor( RECT *rect ) DECLSPEC_HIDDEN;
+extern BOOL process_wine_clipcursor( BOOL empty ) DECLSPEC_HIDDEN;
 
 /* menu.c */
 extern HMENU create_menu( BOOL is_popup ) DECLSPEC_HIDDEN;