Please add excel-like filter for the MultiColumnComboBox.

MultiColumnComboBox need support MultiSelect item?

Is there a way to make the grid in MultiColumnCombox scrollable horizontally? The users will have problems when viewing the MultiColumnComboBox from a phone browser when the width of each column in its popup is large.

Bug report:

MultiColumnComboBox select event is triggered when the dataSource has items with empty text

Reproduce problem:

https://dojo.telerik.com/exAtuTUJ/6

The steps to reproduce this problem:

1. click the dropdown to show options

2. Click anywhere on the document(You will see the alert message, it prompts for trigger event).

Current behavior:

Trigger event anywhere you click on a document.

Expected behavior:

Trigger event only when you click the values in the MultiColumnComboBox component.

Environment:

• Kendo UI version: 2022.2.621
• jQuery version: 1.12.4
• Browser: all

### Bug report

The MultiColumnComboBox is initialized without a specified value. When the user focuses on the widget and leaves it without selecting or entering an option, the "cascade" event is fired.

### Reproduction of the problem

1) Create a MultiColumnComboBox and initialize it without a value;

2) Subscribe to the "cascade" event after the initialization of the widget;

3) Focus the input;

4) Leave it;

5) The "cascade" event is triggered on "blur".

A Dojo sample for reproduction: https://dojo.telerik.com/EViKaXaZ

### Expected/desired behavior

The "cascade" event should fire when changing the widget's value via API or user interaction.

### Environment

* **Kendo UI version: 2021.3.914
* **jQuery version: 1.12.4
* **Browser: [all]

Bug report

When virtualization is enabled in the MultiColumnComboBox and the user scrolls down in the popup to load new items sometimes an item that is not actually hovered is highlighted as hovered (the 'k-hover' class is applied).

Reproduction of the problem

1. Open the Dojo
2. Scroll down to load new items. Note, that the behavior is not consistent and is not reproducible every time.

Current behavior

Sometimes random item that is not hovered has the 'k-hover' class.
screencast - https://www.screencast.com/t/KXhG7SBkE6

Expected/desired behavior

Items that are not hovered should not have the k-hover class and should not be highlighted as hovered.

Environment

• Kendo UI version: 2022.2.802
• Browser: [all ]