Steps to reproduce bug:

• Navigate to demo with Multi-columns header https://demos.telerik.com/kendo-ui/treelist/multicolumnheaders
• Click on "Edit this example" button
• On dojo edit code to add needed lib:
• <script src="https://kendo.cdn.telerik.com/2019.1.220/js/jszip.min.js"></script>

• add also toolbar: ["excel"] on config options
• Run dojo and hit export

The result has broken Headers

When the Kendo UI Treelist is horizontally scrollable and a filter is applied which returns no items, the scrollbar disappears. Therefore, if the column is one of the hidden ones, it would be impossible to navigate to it in order to clear the filter. 

A Dojo sample for the reproduction of the issue:

https://dojo.telerik.com/IQuHuNej

Bug report

TreeList shows wrong total and paging when we expand or collapse a row after filtering.

Reproduction of the problem

1. Go to TreeList demo link - https://demos.telerik.com/kendo-ui/treelist/index
2. On "Position" column apply filter with value "VP, Engineering"

Expected/desired behavior

The shown message within the pager has to be "1 - 4 of 4 items" instead of "1 - 15 of 4 items".

Environment

* **Kendo UI version:** 2019.3.1024
* **jQuery version:** 1.12.4
* **Browser:** [all] 

Bug report

If the read() method of the data source of the TreeList widget is called, the pager is not refreshed. It retains the only pages and information.

Reproduction of the problem

1. Update the data source of the TreeList widget.

2. Notice that the pager is not completely refreshed.

A Dojo sample for reproduction:

https://dojo.telerik.com/aHIPUgIz

Expected/desired behavior

Refresh the pager whenever the data source of the TreeList is refreshed.

Environment

* **Kendo UI version:** 2019.3.1023
* **jQuery version:** 1.12.4
* **Browser:** [all] 

Collapse state is incorrect when exporting TreeList while some nodes are collapsed.

• https://dojo.telerik.com/@pmilchev/aMUniceC 

Reproduction steps: 

• Open and run the dojo example
• Click the Export button in TreeList
• Click the toggle button of the item

Actual: Alert shows "Collapsed"

Expected: Alert shows "Expanded"

Regression introduced in 2019.2.514
Related to: https://github.com/telerik/kendo-ui-core/issues/4696 

Code: https://github.com/telerik/kendo/blame/master/src/excel/main.js#L43 

Bug report

TreeList autoFitColumn doesn't work properly.

Reproduction of the problem

Run the first sample from here:
https://docs.telerik.com/kendo-ui/api/javascript/ui/treelist/methods/autofitcolumn

Alternatively, open this dojo:
https://dojo.telerik.com/uvafiZeh

Current behavior

Expected/desired behavior

TicketID:

1519223

### Bug report

The height of the locked content in Chrome with jQuery version 3.4.1 (all jQuery versions after 3.1.1) is not calculated correctly.

### Reproduction of the problem

1. Set locked content in the TreeList.
2. The height is not calculated correctly.

Dojo sample for reproduction:

 https://dojo.telerik.com/EsobuqAH

### Environment

* **Kendo UI version:** 2020.1.219
* **jQuery version:** 3.4.1
* **Browser:** [Chrome | IE | Edge] 

### Bug report

When the footerTemplate option of the TreeList is specified for a column that is part of a multi-column header configuration, the template is not rendered.

### Reproduction of the problem

1. Set a footerTemplate option for the nested column. Dojo sample for reproduction:

https://dojo.telerik.com/iKisAZaS/16

### Environment

* **Kendo UI version:** 2020.1.219
* **jQuery version:** 1.12.4
* **Browser:** [all ] 

### Bug report

When the columns of the Kendo UI TreeList have the attributes option set, a JavaScrip error is thrown. 

### Reproduction of the problem

1. Set the attributes property for any of the columns in the TreeList.

2. Call the setOptions() method.

3. An error in the console is present.

https://dojo.telerik.com/OKUnEDiJ

### Environment

* **Kendo UI version:** 2020.3.1118
* **jQuery version:** 1.12.4
* **Browser:** [all[]

Hello,

We found a bug in the latest version of Kendo related to the reordering columns in Treelist when inside a Grid DetailTemplate

See the Dojo below to replicate the problem:

https://dojo.telerik.com/exotEsej

Expand the detail row under a grid row and attempt to drag one of the treelist column titles to the left or right and note that an error is thrown.

Uncaught TypeError: Cannot read properties of undefined (reading 'lockable')

Let us know when you have a workaround for this as it prevents us from promoting this version of Kendo to our production environment.

Thank you,

Brad Garner

When using the grid in navigatable mode, cells are correctly described, as seen in line 6014 of kendo.grid.js:

if (navigatable) {
   rowTemplate += ' aria-describedby=\'' + column.headerAttributes.id + '\'';
}

This simple, yet essential functionality is missing in TreeList.

Hi 

In the TreeList control when I Freeze first column and apply multi column header in some other column, then setting the filterable property for a column after multi column header is applied to some other column instead of the column on which it is set.

You can find a working sample here.

In this example note that I have set the filterable property false for field "Phone" but its effect is applied on "Position" field and its filters are hidden. Similarly if you apply filterable: false on "Extention" field then the filter on "Address" field will be gone.

Kindly provide a solution for this problem, also let me know if a work around exists for this issue.

Bug report

TreeList Drag and drop row to the bottom of the list does not work when the bottom item has no children

Reproduction of the problem
1. Open the following Dojo: 

https://dojo.telerik.com/eTiZONIj

2. Drag Jane and Drop it under Maria

Current behavior

Jane goes above Maria
Expected/desired behavior
Jane shall be placed at the bottom of the list under Maria

Environment
Kendo UI version: 2020.3.1118
Browser: [all]

### Bug report

The change event is not triggered, when a checkbox is selected in the Keno UI TreeList widget.

### Reproduction of the problem

1) Create a checkbox selectable TreeList widget;

2) Select/check any of the checkboxes;

3) The change event is not triggered;

4) Unselect/uncheck any of the checkboxes;

5) The change event is triggered;

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

### Expected/desired behavior

The change event should be triggered, when a checkbox is selected in a checkbox selectable TreeList widget.

### Environment

* **Kendo UI version:**2021.1.119
* **jQuery version:** 1.12.4
* **Browser:** [all]

Hello,

We have a grid of tasks and each row has a detail's pane (hierarchy) that shows, when expanded, a tree list of sub-tasks.

If you attempt to delete a tree list node (not the last) it will delete the node correctly, but will trigger the grid's to prompt the user to make sure the item should be deleted or not (which is NOT normal). But when this is shown, it is already too late to Cancel has the tree list has already deleted the item. Users don't understand why they are given a chance to prevent the deletion, but it does not work.

So in short, we want the tree list, when the users deletes a node, to not trigger (i.e. to prevent) the grid's item deletion.

Here is a dojo that shows what happens:

https://dojo.telerik.com/APaXoRuR

1. Load the Dojo and open the Network tab of the developer toolbar
2. Expand one of grid's detail row
3. Attempt to delete one of the tree list items (except the last item)
4. Note the dialog popup which is not normally shown for a treelist
5. Note the Item is already deleted anyway... before the popup is shown...
6. Click Cancel on the dialog
7. The item disappears even if you did cancel

Please let me know if you need more information,

Regards,

Eric.

Eric Boulé, B.Eng.
Solution Architect
Centre d’Essais Techniques de la Qualité (CETQ) | Quality Engineering Test Establishment (QETE)
Department of National Defence / Government of Canada
Eric.Boule@forces.gc.ca

Bug report

TreeList with TextArea editor and locked columns do not align row height between locked and non-locked tables

Reproduction of the problem
1, Open below Dojo
2. Click on a cell within the locked table to edit

https://dojo.telerik.com/UwUmoWOX

Current behavior
Clicked locked row height not aligned with the row height of the non-locked row

Expected/desired behavior
TreeList with TextArea editor and locked columns shall align rows between locked and non-locked tables

Workaround:

$("#treelist").getKendoTreeList()._syncLockedContentHeight();

• https://dojo.telerik.com/EMajaCUY

Environment
Kendo UI version: all
jQuery version: x.y
Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

Setup a Treelist with paging

edit set to popup

get "Maximum call stack size exceeded" error after update

I removed the paging and it works as expected

In a out of the box popup edit, the update/cancel buttons are to the left, should be to the right for consistency with grid. Add class k-actions-end to the div with k-edit-buttons as done in grid.

I am using bootstrap-v4 css file.