This is an error that took us an hour to figure out.

We are using the right-arrow icon as part of the content within a collapsible header to represent a state transition. (See image)

We found that the expand/collapse icon did not appear.

Further investigation reveals that if the header content contains a span with a class matching the regular expression k-i-arrow.* then the expand/collapse icon doesn't work. It could contain anything else, it was just that one class pattern that threw it.

See this example. https://dojo.telerik.com/EwAsaKAf/3

I also posted a forum message here: https://www.telerik.com/forums/expand-collapse-arrow-fails-to-appear-if-a-class-matching-a-certain-pattern-appears-anywhere-in-the-header   

This is clearly a bug, and one that I suspect can be fixed easily.

As of Kendo UI R3 2018, template expressions in AngularJS are automatically escaped and as a result, our app is broken in some areas and we've rolled back to the previous version. At least give us the option to turn off escaping template expressions or offer a smarter sanitization method that can accept AngularJS template expressions within Kendo templates.

The ImageBrowser only supports a Path and Filename to identify a file.  It would be nice to be able to use an ID instead of the Filename as an identifier.  This would involve changing the FileBrowserEntry object to include an ID property and make it available throughout (e.g. Thumbnail and Image URLs). 

your claims your components are accessible according to WCAG success criteria are not valid.

Even your own website is not keyboard accessible. 

Try using a keyboard to navigate your components and you will understand why.

I will be recommending that our organization not use Kendo UI until you address all 38 WCAG 2.0 Levels A and AA Success Criteria.

Include Flow type definitions for kendo-ui jquery modules. 

Support Value template on ComboBox & MultiColumnComboBox

 I would like to see away to cross reference releases to the API docs.  So when a new method, property, etc. becomes available for a control or framework, I can see what release it was associated with.  This will permit me to upgrade apps to specific versions. Or during an update, I can see where a breaking change occurred.  I'm sure lots of other benefits could come from that.

The Detailed description In:
https://github.com/telerik/kendo-ui-core/issues/3903


Bug report
Currently, DataSource bound Spreadsheet throws "Unsupported for multiple ranges" error when attempting to delete the content from multiple not adjusted cells.

The error is thrown by the values() method:

values: function (values) {
    if (this._ref instanceof UnionRef) {
        throw new Error('Unsupported for multiple ranges.');
    }
    if (this._ref === kendo.spreadsheet.NULLREF) {
....
Reproduction of the problem
Go to the DataSource Binding demo;
Select a few cells using the Ctrl + click;
Press Delete button on the keyboard;
"Unsupported for multiple ranges" error will be thrown from the values() method;

This bug has not been resolved in Version 2018.3.911. 

I could attach a screen shot of this, but there doesn't seem to be a way to attach anything.

It would be nice to know what version a function or method was released in. Please add the version to the documentation so users can easily understand if the function is available in the version they are using.

There is s set precedence among many of your Kendo UI controls in providing a tool tip option, yet the NumericTextBox is not one of them. 

Radio buttons fire events and web developers rely on these events to capture data or initiate a process. I fail to understand why something so basic to a control is overlooked, yet you provide this functionality to most of your other controls. 

it's looks nice if we have an option to move chatbot image to either on first or last of message for multiple messages (currently the chatbot image located on the last message)

In some specific cases, it is required to show a bubble within a bubble in the Bubble chart. This is required to demonstrate some specific property within the bubble.
e.g.
The bubble position shows which project.
The bubble size demonstrates projects size with respect to the program.
The bubble within the bubble shows the current progress of the project.

When using a grid against a large table with server side filtering (ToDataSourceResult)

ToDataSourceResult builds a SQL query that converts the search string to UPPER() and therefore prevents the database from using its indexes. As SQL comparison is case insensitive that LOWER() is unnecessary.  

As we have may grids where this is an issue it would be time consuming to build out manual filters for each grid instead of using ToDataSourceResult

This was discussed here and there was no solution at the time:

https://www.telerik.com/forums/grid-filtering-on-text-using-lower-in-sql

I would liek to request an option to tell ToDataSourceResult() not to use LOWER() in the sql?

See ticket #1339310

Displaying multiple columns on vertical resources on kendoscheuler resources.

Currently, when all are enabled, it's impossible to scroll, because either multiselect starts or drag&drop. Tested on iPad OS X 11.4

Any widget with the Template property should have a TemplateUrl property which allows the markup to be placed into an external html file similar to TemplateUrls in AngularJS components.