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/arena.rs

@@ -56,7 +56,8 @@ pub struct ElementPath {
 
 impl VirtualDom {
     pub(crate) fn next_element(&mut self) -> ElementId {
-        ElementId(self.elements.insert(None))
+        let mut elements = self.runtime.elements.borrow_mut();
+        ElementId(elements.insert(None))
     }
 
     pub(crate) fn reclaim(&mut self, el: ElementId) {
@@ -71,7 +72,8 @@ impl VirtualDom {
             return true;
         }
 
-        self.elements.try_remove(el.0).is_some()
+        let mut elements = self.runtime.elements.borrow_mut();
+        elements.try_remove(el.0).is_some()
     }
 
     // Drop a scope without dropping its children