fix: link field self linking (#18330) (#18357)

(cherry picked from commit 426ecc5a1e)

Co-authored-by: Ritwik Puri <ritwikpuri5678@gmail.com>

frappe/public/js/frappe/form/controls/link.js

@@ -166,7 +166,7 @@ frappe.ui.form.ControlLink = class ControlLink extends frappe.ui.form.ControlDat
 		frappe.route_options.name_field = this.get_label_value();
 
 		// reference to calling link
-		frappe._from_link = this;
+		frappe._from_link = frappe.utils.deep_clone(this);
 		frappe._from_link_scrollY = $(document).scrollTop();
 
 		frappe.ui.form.make_quick_entry(doctype, (doc) => {

frappe/public/js/frappe/utils/utils.js

@@ -3,6 +3,7 @@
 
 import deep_equal from "fast-deep-equal";
 import number_systems from "./number_systems";
+import cloneDeepWith from "lodash/cloneDeepWith";
 
 frappe.provide("frappe.utils");
 
@@ -1000,6 +1001,10 @@ Object.assign(frappe.utils, {
 		return deep_equal(a, b);
 	},
 
+	deep_clone(obj, customizer) {
+		return cloneDeepWith(obj, customizer);
+	},
+
 	file_name_ellipsis(filename, length) {
 		let first_part_length = (length * 2) / 3;
 		let last_part_length = length - first_part_length;