Add start window hidden tip for window state (#3253)

Author: Legend-Master

src/content/docs/plugin/window-state.mdx

@@ -87,6 +87,12 @@ After adding the window-state plugin, all windows will remember their state when
 
 You can also access the window-state plugin in both JavaScript and Rust.
 
+:::tip
+Restoring the state will happen after window creation,
+so to prevent the window from flashing, you can set `visible` to `false` when creating the window,
+the plugin will show the window when it restores the state
+:::
+
 ### JavaScript
 
 You can use `saveWindowState` to manually save the window state: