Synchronous prevent default (#2792)

* add prevent default methods to the event

* sync prevent default almost working

* sync prevent default working

* Move event handling into the runtime

* update core tests

* restore desktop file dialog

* implement prevent default on web

* add a hint about the new prevent default method

* fix web prevent default

* Fix CTRL+click on links

* fix values memorize in place test

* Fix a few more tests

* Add a playwright test for sync prevent default

* Fix core doc tests

* create a deprecated VirtualDom::handle_event

* fix macos imports in desktop

* Fix onmounted event

* Fix liveview support

* switch to RefCell for metadata

* Remove println

* remove prevent default attribute

* remove web specific link behavior

* Fix liveview links

* more liveview fixes for link

* Fix merge conflicts

* Fix clippy

* use the new prevent default in the file upload example

packages/core/src/diff/iterator.rs

@@ -469,7 +469,8 @@ impl VNode {
     ) -> usize {
         let template = self.template;
 
-        let mount = dom.mounts.get(self.mount.get().0).unwrap();
+        let mounts = dom.runtime.mounts.borrow();
+        let mount = mounts.get(self.mount.get().0).unwrap();
 
         template
             .roots