refactor: move menu wheel trap helper

rust/spikes/leptos-tiptap-spike/src/lib.rs

@@ -41,7 +41,9 @@ use editor_runtime::command_sync::{
     read_editor_snapshot, sync_editor_outputs, sync_persisted_editor_command,
 };
 use editor_runtime::content_layout::{content_column_left, content_text_left};
-use editor_runtime::dom_events::{event_target_matches_selector, target_element};
+use editor_runtime::dom_events::{
+    event_target_matches_selector, target_element, trap_scroll_inside_menu,
+};
 use editor_runtime::dom_selection::{
     block_index_from_selection, current_block_info_from_index, runtime_block_id_from_index,
     selection_payload, selection_summary, SelectionPayload,
@@ -4810,24 +4812,6 @@ fn handle_lane_left(stage_rect_width: f64) -> f64 {
         .max(HANDLE_STAGE_PADDING_LEFT)
 }
 
-fn current_target_html_element(event: &WheelEvent) -> Option<HtmlElement> {
-    event.current_target()?.dyn_into::<HtmlElement>().ok()
-}
-
-fn trap_scroll_inside_menu(event: &WheelEvent) {
-    event.prevent_default();
-    event.stop_propagation();
-
-    let Some(menu) = current_target_html_element(event) else {
-        return;
-    };
-
-    let current = f64::from(menu.scroll_top());
-    let max_scroll = f64::from((menu.scroll_height() - menu.client_height()).max(0));
-    let next = (current + event.delta_y()).clamp(0.0, max_scroll);
-    menu.set_scroll_top(next.round() as i32);
-}
-
 fn hovered_block_from_target(target: web_sys::EventTarget) -> Option<HoveredBlockState> {
     let root = editor_root_element()?;
     hovered_block_from_target_runtime(target, &root, HANDLE_SHELL_SELECTOR)