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/interpreter/src/write_native_mutations.rs

@@ -189,3 +189,23 @@ impl WriteMutations for MutationState {
         self.channel.push_root(id.0 as _);
     }
 }
+
+/// A synchronous response to a browser event which may prevent the default browser's action
+#[cfg_attr(feature = "serialize", derive(serde::Serialize))]
+#[derive(Default)]
+pub struct SynchronousEventResponse {
+    #[cfg(feature = "serialize")]
+    #[serde(rename = "preventDefault")]
+    prevent_default: bool,
+}
+
+impl SynchronousEventResponse {
+    /// Create a new SynchronousEventResponse
+    #[allow(unused)]
+    pub fn new(prevent_default: bool) -> Self {
+        Self {
+            #[cfg(feature = "serialize")]
+            prevent_default,
+        }
+    }
+}