refactor: extract dnd target and sidebar helpers

rust/crates/mnote-web/browser/filetree-runtime.js

@@ -214,6 +214,17 @@ function groupRowsByParent(rows) {
   return grouped;
 }
 
+function replaceSidebarTreeFromDocument(nextDocument, rootId) {
+  var current = document.getElementById(rootId);
+  var next = nextDocument ? nextDocument.getElementById(rootId) : null;
+  if (!(current instanceof HTMLElement) || !(next instanceof HTMLElement)) return false;
+  current.innerHTML = next.innerHTML;
+  Array.from(next.attributes || []).forEach(function(attr) {
+    current.setAttribute(attr.name, attr.value);
+  });
+  return true;
+}
+
 function revealFileTreeRow(row) {
   if (!(row instanceof HTMLElement)) return;
   var node = row.closest('.tree-node');
@@ -351,6 +362,7 @@ window.__mnoteFileTreeRuntime = {
   titleOf: titleOf,
   fileWorkspaceRelativePath: fileWorkspaceRelativePath,
   groupRowsByParent: groupRowsByParent,
+  replaceSidebarTreeFromDocument: replaceSidebarTreeFromDocument,
   fileTreeRowKind: fileTreeRowKind,
   fileTreeRowDocumentId: fileTreeRowDocumentId,
   fileTreeRowAssetId: fileTreeRowAssetId,