The issue is reproducible when the grid consists only from Multi-header columns, the setDataSource() method has been used and one of the columns is initially hidden.

After setting the new data source, the last header gets hidden. The "display: none;" style has been applied to the "th" HTML element.

Steps to reproduce:

1. Create a grid with multi-header columns only.

2. Hide one column initially.

3. Set a new data source via the setDataSource() method.

4. The last column gets hidden.

Sample Dojo:

https://dojo.telerik.com/AcipENOt

Kendo UI version: 2019.1.220

When using MVVM, when modal = true, the entire page is always in modal mode at page load even if the dialog is not visible. When not using MVVM, when the dialog is not visible, the page is not in modal mode which is expected.

Here is a modified Dojo that I got from your demo page that I set the dialog to not visible but the modal is on at page load. 

https://dojo.telerik.com/OYOcedum

Here is the same not using MVVM that the dialog is set to not visible and the modal is not on at page load as expected.

https://dojo.telerik.com/oHaZukUf

Bug report

The performance in the latest official version is significantly worse compared to older versions (2017.1.117 and 2018.1.118 tested).

Reproduction of the problem

Dojo example.

1. Click a cell
2. Press Ctrl + A
3. Select a font size from the dropdown in the Spreadsheet's toolbar

Current behavior

The UI freezes and remains unresponsive for minutes.

Expected/desired behavior

The new font size is applied without significant delay.

Environment

• Kendo UI version: 2019.2.514
• jQuery version: x.y
• Browser: [all]

I'm using kendo ui for mvc and a control that could be very useful is a captcha for form submission.For sure you can integrate it by using Google reCaptcha in a easy way not only for kendo ui for web but for mvc also.A good idea could be to integrate you own captcha control (for intranet environment, or private internet network ) because reCaptcha only work with a stable internet connection (Google Web Service).

See Kendo UI v2019.1.220 Distributed Source Code module kendo.splitter.js _resize() method (Lines 285-240) 

1) The splitter _resize method iuses jQuery width() and height() methods to set pane sizes.

2) These methods get/set the clientHeight and clientWidth of the pane element rather than the offsetWidth and offsetHeight. 

3) If any pane has a border or padding, the last pane will extend beyond the limits of the splitter element.

4) Recommend using offsetWidth and offsetHeight to get/set all pane sizes. 

Bug report

The usage of $.uniqueSort() in jQuery 1.10.x throws an error in multiple components like Menu, DropDownList, DropDownTree, and TreeView.

Related to #4665

Reproduction of the problem

1. Open this Dojo and try to use some of the components in it.
2. Error messages appear in the console and the components get stuck

Current behavior

Expected/desired behavior

All components should work properly no matter of the jQuery version used.

To see the expected behavior change
<script src="https://code.jquery.com/jquery-1.11.1.min.js"></script>
to
<script src="https://kendo.cdn.telerik.com/2019.2.514/js/jquery.min.js"></script> in the provided Dojo.

Environment

• Kendo UI version: 2019.2.514
• jQuery version: 1.10.x
• Browser: [all]

Bug report

When pasting data from Excel, the data is being pasted as an image instead of values

Reproduction of the problem

1. Open https://dojo.telerik.com/UKAFAkEn
2. Open new Excel file on your system in MS Excel application
3. Enter data 1, 2, 3, 4, 5 in A1 to A5 in sheet1
4. Copy data from A1 to A5 from the local file
5. Paste data in C3 of Spreadsheet opened in step 1
6. The pasted result is an image instead of values

Current behavior

Pasting from Excel results in an image

Expected/desired behavior

Pasting from Excel should result in correctly filled data cells

Environment

• Kendo UI version: 2019.2.514
• jQuery version: x.y
• Browser: [Chrome 74.0.3729.131 | Firefox 66.0.5 | Edge 42.17134.1.0 ]

We need a way to disable the _step function (kendo.web.js) from being run whenever keying up or down in a nullable NumericTextBox grid column. Without this, moving between cells is setting the value of the cell being stepped out of to zero despite no text/numerical input. Our workaround was to override the Kendo JS to skip the majority of the _step logic by checking for whether spinners were disabled:

if(that.options.spinners === false) {
	return;
}

See support ticket logged for further information and code/video example: https://www.telerik.com/account/support-tickets/view-ticket/1408355

The images inside the editor Widget are resizable only when using Firefox. It would be great if the resize option for images is also available for other "big" browsers like Chrome, Safari and IE. I'm aware of the thread that says that only Firefox supports image resizing by default. This could be implemented independent of supporting it by browsers. Many other (opensource) editors like tinymce support that feature by default, that could be implement by Javascript instead of waiting for other browsers supporting it.

It seems that you would want to conditionally have clearSelection() behave differently with persistSelection enabled, as it does not clear the selection of items on other pages. At the very least offer us a clearAllSelections() method if modifying the behavior of the other method is not desirable.

Bug report

An error occurs on components' initialization when using a custom Kendo UI build which includes PDFviewer

Reproduction of the problem

1. Go to Kendo UI Custom Download page
2. In the "WEB" section select random components including the Grid and PDFviewer
3. Download the custom build(kendo.custom.min.js file) and put it in the same folder with an HTML file with the following structure.

<!DOCTYPE html>
<html>

<head>
    <style>
        html {
            font-size: 14px;
            font-family: Arial, Helvetica, sans-serif;
        }
    </style>
    <title></title>
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2019.2.514/styles/kendo.default-v2.min.css" />

    <script src="https://kendo.cdn.telerik.com/2019.2.514/js/jquery.min.js"></script>
    <script src="./kendo.custom.min.js"></script>
</head>

<body>
    <div id="example">
        <div id="grid"></div>
        <script>
            $(document).ready(function () {
                $("#grid").kendoGrid({
                    dataSource: {
                        type: "odata",
                        transport: {
                            read: "https://demos.telerik.com/kendo-ui/service/Northwind.svc/Customers"
                        },
                        pageSize: 20
                    },
                    height: 550,
                    groupable: true,
                    sortable: true,
                    pageable: {
                        refresh: true,
                        pageSizes: true,
                        buttonCount: 5
                    },
                    columns: [{
                        template: "<div class='customer-name'>#: ContactName #</div>",
                        field: "ContactName",
                        title: "Contact Name",
                        width: 240
                    }, {
                        field: "ContactTitle",
                        title: "Contact Title"
                    }, {
                        field: "CompanyName",
                        title: "Company Name"
                    }, {
                        field: "Country",
                        width: 150
                    }]
                });
            });
        </script>
    </div>
</body>
</html>

4. The following error appears:
   Uncaught TypeError: Cannot read property 'Toolbar' of undefined

Current behavior

Expected/desired behavior

A Grid should be initialized properly and without errors if a custom build is including the PDFviewer

Environment

• Kendo UI version: 2019.2.514
• jQuery version: x.y
• Browser: [all]

Bug report

File:
3f0465a2-412c-4876-ba47-4b12ae46f92e_adam.zip

https://demos.telerik.com/kendo-ui/spreadsheet/index

Reproduction of the problem

1. Import the file

Current behavior

Errors are encountered. Even if resolving the errors bold styles are not applied as they are part of the font definition and not of the inlineStyles.

Expected/desired behavior

The excel is imported as expected.

Environment

• Kendo UI version: 2019.2.514
• Browser: all

Dear Telerik,

Please check this example. The single difference than the original one from the demos section, is that I deleted the tasksDataSource.schema.model.fields.parentId.defaultValue". Now the default value of the parentId will be 0 instead of null. If you try to add a new task, the logic will break because of inifinity loop caused by the new task with id=0 and parent=the same task(parentId=0).

I checked the documentation at https://docs.telerik.com/kendo-ui/api/javascript/data/ganttdatasource/configuration/schema and this obligation is missing. It is something small that can save an hour to someone else. 

Best Regards, Boyan.

I want to know the combination keys that generate the paste event 

Thx,

Kendo UI supports PDF export. It would be great if you could add glyph mirroring support to it as well (https://github.com/mozilla/pdf.js/blob/master/src/core/bidi.js). PDF export of RTL languages such as Arabic and Persian need this trick to work properly.

1. use safari browser

2. Go to https://demos.telerik.com/kendo-ui/editor/index

3.  copy a long text over 25 characters

4. paste the copied text in the editor

5. notice that the scroll takes you to the bottom of the page, The same is not noticed in any other browser.

6. This is very inconvenient. 

Steps to reproduce:

1. Go to https://demos.telerik.com/kendo-ui/editor/index using IE11

2. Delete a sentence in the editor by repeatedly pressing the backspace key.

Result:

The characters are deleted slowly with noticeable lag and jank.

Investigation

The following profile shows the FPS drop when you repeatedly press backspace.

I believe the call to refreshTools is expensive (for IE) and it is invoked on every keyup for backspace.