MultiSelect is closing when used as Grid editor

[nelito987]

Bug report

When the MultiSelect is used inside the Grid as a custom editor, the component gets closed on focus or when the user tries to select a second item.

Reproduction of the problem

1. Open the Dojo - https://dojo.telerik.com/IKrPxAmi.
2. Click the 'Edit' button and try to select two items in the third column 'Dont work'.

Current behavior

The first item is correctly selected, however, the pop-up is closed every time the user clicks in the input, thus it is not possible to select a second item.

Expected/desired behavior

The popup should not close on focus the MultiSelect input and it should be possible to select multiple items.

The issue is a regression starting with 2025.2.520

Workaround

The MultiSelect is not closed when the downArrow is enabled (column 'Works'). Possible approach for MVVM scenario:

 edit: function (e) {
              $('[data-container-for="aproductName"] .k-multiselect input')
                .data("kendoMultiSelect")
                .setOptions({
                  downArrow: true,
                });
            },

Ticket ID: 1689792

Environment

• Kendo UI version: 2025.2.520
• Browser: [all ]