refactor: extract hovered block index helper

rust/spikes/leptos-tiptap-spike/src/editor_runtime/block_dnd.rs

@@ -95,6 +95,18 @@ pub(crate) fn direct_block_from_element(mut element: Element, root: &Element) ->
     }
 }
 
+pub(crate) fn direct_block_index_from_element(
+    element: &Element,
+    root: &Element,
+    handle_selector: &str,
+) -> Option<usize> {
+    if element_within_handle_shell(element, handle_selector) {
+        return None;
+    }
+    let block = direct_block_from_element(element.clone(), root)?;
+    top_level_block_index(root, &block)
+}
+
 pub(crate) fn top_level_block_index(root: &Element, block: &Element) -> Option<usize> {
     let children = root.children();
     (0..children.length()).find_map(|index| {