feat(stock): multi select item and warehouse filters in warehouse wise item balance

the item and warehouse filters took one value at a time, so comparing a
few warehouses meant re-running the report for each one.

both are multiselectlist now, matching the stock balance report. the
warehouse column list unions the subtree of every selected warehouse,
and get_items passes a list through instead of wrapping it. plain string
values still work, so saved filters and existing callers are unaffected.

(cherry picked from commit 3c92a9e853)

erpnext/stock/report/stock_analytics/stock_analytics.py

@@ -270,7 +270,7 @@ def get_chart_data(period_columns):
 def get_items(filters):
 	"Get items based on item code, item group or brand."
 	if item_code := filters.get("item_code"):
-		return [item_code]
+		return [item_code] if isinstance(item_code, str) else list(item_code)
 	else:
 		item_filters = {"is_stock_item": 1}
 		if item_group := filters.get("item_group"):

erpnext/stock/report/warehouse_wise_item_balance_age_and_value/warehouse_wise_item_balance_age_and_value.js

@@ -38,21 +38,49 @@ frappe.query_reports["Warehouse wise Item Balance Age and Value"] = {
 		{
 			fieldname: "item_code",
 			label: __("Item"),
-			fieldtype: "Link",
+			fieldtype: "MultiSelectList",
 			width: "80",
 			options: "Item",
+			get_data: async function (txt) {
+				const item_group = frappe.query_report.get_filter_value("item_group");
+
+				let { message: data } = await frappe.call({
+					method: "erpnext.controllers.queries.item_query",
+					args: {
+						doctype: "Item",
+						txt: txt,
+						searchfield: "name",
+						start: 0,
+						page_len: 10,
+						filters: {
+							...(item_group && { item_group }),
+							is_stock_item: 1,
+						},
+						as_dict: 1,
+					},
+				});
+
+				data = data.map(({ name, ...rest }) => {
+					return {
+						value: name,
+						description: Object.values(rest),
+					};
+				});
+
+				return data || [];
+			},
 		},
 		{
 			fieldname: "warehouse",
 			label: __("Warehouse"),
-			fieldtype: "Link",
+			fieldtype: "MultiSelectList",
 			width: "80",
 			options: "Warehouse",
-			get_query: function () {
+			get_data: function (txt) {
 				const company = frappe.query_report.get_filter_value("company");
-				return {
+				return frappe.db.get_link_options("Warehouse", txt, {
-					filters: { company: company },
+					...(company && { company }),
-				};
+				});
 			},
 		},
 		{

erpnext/stock/report/warehouse_wise_item_balance_age_and_value/warehouse_wise_item_balance_age_and_value.py

@@ -7,6 +7,7 @@
 
 import frappe
 from frappe import _
+from frappe.query_builder import Criterion
 from frappe.query_builder.functions import Count
 from frappe.utils import cint, flt, getdate
 
@@ -115,7 +116,8 @@ def validate_filters(filters):
 
 
 def get_warehouse_list(filters):
-	if not filters.get("warehouse"):
+	warehouses = filters.get("warehouse")
+	if not warehouses:
 		return frappe.get_all(
 			"Warehouse",
 			filters={"company": filters.get("company"), "is_group": 0},
@@ -123,13 +125,22 @@ def get_warehouse_list(filters):
 			order_by="name",
 		)
 
+	if isinstance(warehouses, str):
+		warehouses = [warehouses]
+
+	# columns cover every selected warehouse along with its descendants
+	subtrees = frappe.get_all("Warehouse", filters={"name": ("in", warehouses)}, fields=["lft", "rgt"])
+	if not subtrees:
+		return []
+
 	warehouse = frappe.qb.DocType("Warehouse")
-	lft, rgt = frappe.db.get_value("Warehouse", filters.get("warehouse"), ["lft", "rgt"])
+	condition = Criterion.any([(warehouse.lft >= row.lft) & (warehouse.rgt <= row.rgt) for row in subtrees])
 
 	return (
 		frappe.qb.from_(warehouse)
-		.select("name")
+		.select(warehouse.name)
-		.where((warehouse.lft >= lft) & (warehouse.rgt <= rgt))
+		.where(condition)
+		.orderby(warehouse.name)
 		.run(as_dict=True)
 	)