Bug report

Regression introduced in R1 2020.

Reproduction of the problem

Reproducible in the demo.

1. Focus the DropDownTree.
2. Click the "Check all" checkbox.

Current behavior

The DropDownTree items are not checked. The issue is reproducible only if the checkbox is clicked. Clicking its label, or checking the checkbox with the keyboard (Space key) checks all items as expected.

Expected/desired behavior

All items are checked.

Environment

• Kendo UI version: 2020.1.219
• jQuery version: x.y
• Browser: [IE, Edge(Spartan) ]