Added close behaviour option for specific window (#3754)

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/desktop/src/webview.rs

@@ -2,6 +2,7 @@ use crate::element::DesktopElement;
 use crate::file_upload::DesktopFileDragEvent;
 use crate::menubar::DioxusMenu;
 use crate::PendingDesktopContext;
+use crate::WindowCloseBehaviour;
 use crate::{
     app::SharedContext,
     assets::AssetHandlerRegistry,
@@ -160,6 +161,7 @@ pub(crate) struct WebviewInstance {
     pub edits: WebviewEdits,
     pub desktop_context: DesktopContext,
     pub waker: Waker,
+    pub close_behaviour: Option<WindowCloseBehaviour>,
 
     // Wry assumes the webcontext is alive for the lifetime of the webview.
     // We need to keep the webcontext alive, otherwise the webview will crash
@@ -431,6 +433,7 @@ impl WebviewInstance {
             desktop_context,
             _menu: menu,
             _web_context: web_context,
+            close_behaviour: cfg.window_close_behaviour,
         }
     }