fix(sales order): incorrect no. of items fetched while creating dn

[nextchamp-saqib]

Issue:

If a Sales Order has more than 50 items (has multiple pages in item table), and there are some undelivered items. Some undelivered items have a different delivery date.
If some of the "undelivered items" belong to the next page of the items table for eg. an "undelivered item" has an index of 55 (like 51+)

Then while creating Delivery Note using Create button, those "next page" items are not fetched.

Why?

The frm.fields_dict['items'].grid.grid_rows contains only first 50 rows hence filtering only works on first 50 item rows

erpnext/erpnext/selling/doctype/sales_order/sales_order.js

Lines 503 to 509 in c6a17d1

	$.each(dates, function(i, d) {
	$.each(item_grid.grid_rows || [], function(j, row) {
	if(row.doc.delivery_date == d) {
	row.doc.__checked = 1;
	}
	});
	})

[codecov]

Codecov Report

Merging #29454 (4c8408a) into develop (28994c0) will decrease coverage by 0.16%.
The diff coverage is 60.00%.

@@             Coverage Diff             @@
##           develop   #29454      +/-   ##
===========================================
- Coverage    58.36%   58.19%   -0.17%     
===========================================
  Files         1091     1091              
  Lines        67899    67904       +5     
===========================================
- Hits         39629    39517     -112     
- Misses       28270    28387     +117     

Impacted Files	Coverage Δ
erpnext/selling/doctype/sales_order/sales_order.py	77.50% <60.00%> (+0.21%)	⬆️
...unts/report/purchase_register/purchase_register.py	34.24% <0.00%> (-39.05%)	⬇️
erpnext/utilities/product.py	14.70% <0.00%> (-35.30%)	⬇️
...ext/accounts/report/balance_sheet/balance_sheet.py	36.36% <0.00%> (-21.82%)	⬇️
erpnext/shopping_cart/product_info.py	30.30% <0.00%> (-21.22%)	⬇️
...e_purchase_register/item_wise_purchase_register.py	58.00% <0.00%> (-17.00%)	⬇️
...it_and_loss_statement/profit_and_loss_statement.py	71.42% <0.00%> (-3.90%)	⬇️
.../report/bom_operations_time/bom_operations_time.py	89.13% <0.00%> (-2.18%)	⬇️
...e/shopping_cart_settings/shopping_cart_settings.py	66.03% <0.00%> (-1.89%)	⬇️
...eorder_level/itemwise_recommended_reorder_level.py	92.45% <0.00%> (-1.89%)	⬇️
... and 18 more