Support metadata in MultiNodeEdit

Small hack for metadata to work there (similar to existing script hack).
Does not appear within its own category, not sure if its worth hacking it (would need to be hacked in inspector).

Fixes #59604.

editor/multi_node_edit.cpp

@@ -48,6 +48,8 @@ bool MultiNodeEdit::_set_impl(const StringName &p_name, const Variant &p_value,
 
 	if (name == "scripts") { // Script set is intercepted at object level (check Variant Object::get()), so use a different name.
 		name = "script";
+	} else if (name.begins_with("Metadata/")) {
+		name = name.replace_first("Metadata/", "metadata/");
 	}
 
 	Node *node_path_target = nullptr;
@@ -98,6 +100,8 @@ bool MultiNodeEdit::_get(const StringName &p_name, Variant &r_ret) const {
 	String name = p_name;
 	if (name == "scripts") { // Script set is intercepted at object level (check Variant Object::get()), so use a different name.
 		name = "script";
+	} else if (name.begins_with("Metadata/")) {
+		name = name.replace_first("Metadata/", "metadata/");
 	}
 
 	for (const NodePath &E : nodes) {
@@ -137,14 +141,18 @@ void MultiNodeEdit::_get_property_list(List<PropertyInfo> *p_list) const {
 		List<PropertyInfo> plist;
 		n->get_property_list(&plist, true);
 
-		for (const PropertyInfo &F : plist) {
+		for (PropertyInfo F : plist) {
 			if (F.name == "script") {
 				continue; // Added later manually, since this is intercepted before being set (check Variant Object::get()).
+			} else if (F.name.begins_with("metadata/")) {
+				F.name = F.name.replace_first("metadata/", "Metadata/"); // Trick to not get actual metadata edited from MultiNodeEdit.
 			}
+
 			if (!usage.has(F.name)) {
 				PLData pld;
 				pld.uses = 0;
 				pld.info = F;
+				pld.info.name = F.name;
 				usage[F.name] = pld;
 				data_list.push_back(usage.getptr(F.name));
 			}