AllowCopy copies only locked columns instead of all Grid columns

[ivaylo-milanov]

Bug report

When a Grid has both Locked Columns and the AllowCopy configuration enabled, only the locked columns are copied instead of all columns.

Reproduction of the problem

1. Open the dojo: https://dojo.telerik.com/ikbiNjEW
2. Drag to select all columns, then copy the selected content(CTRL+C).
3. Paste the copied columns into the desired location (CTRL+V).

Current behavior

Content only from the Locked columns is copied.

Expected/desired behavior

Content from all columns must be copied.

The issue is a regression starting with 2024.3.1015

Environment

• Kendo UI version: 2024.4.1112
• Browser: [all]