We recently upgrade Kendo UI from version v2019.1.220 to 2019.2.619 and our user base is freaking out because they can't select the text on web pages that use the splitter.
thank you for reporting this behavior. I have investigated further and this appears to be a bug. Thus, I have converted this item to a bug in the Public Feedback Portal and also logged it on GitHub:
As a temporary workaround the css styling can be updated as follows:
A dojo with a the above suggestion implemented is available here.
As a small token of gratitude for helping us discover this issue, I have updated your Telerik Points accordingly