Revert "fix(ux): don't update qty blindly" (backport #38728) (#38730)

Revert "fix(ux): don't update qty blindly" (#38728)

(cherry picked from commit 6851c50)

Co-authored-by: Ankush Menat <ankush@frappe.io>

erpnext/public/js/controllers/transaction.js

@@ -472,6 +472,7 @@ erpnext.TransactionController = class TransactionController extends erpnext.taxe
 				item.pricing_rules = ''
 				return this.frm.call({
 					method: "erpnext.stock.get_item_details.get_item_details",
+					child: item,
 					args: {
 						doc: me.frm.doc,
 						args: {
@@ -520,19 +521,6 @@ erpnext.TransactionController = class TransactionController extends erpnext.taxe
 					callback: function(r) {
 						if(!r.exc) {
 							frappe.run_serially([
-								() => {
-									var child = locals[cdt][cdn];
-									var std_field_list = ["doctype"]
-										.concat(frappe.model.std_fields_list)
-										.concat(frappe.model.child_table_field_list);
-
-									for (var key in r.message) {
-										if (std_field_list.indexOf(key) === -1) {
-											if (key === "qty" && child[key]) continue;
-											child[key] = r.message[key];
-										}
-									}
-								},
 								() => {
 									var d = locals[cdt][cdn];
 									me.add_taxes_from_item_tax_template(d.item_tax_rate);