In the Microsoft Edge browser when I select a block of data (blockselect) the text in the single datatable cells is selected as well. This is happening in the current version of Webix - 5.4.
Apparently, this breaks the CTRL-V/CTRL-C functionality as when pressing CTRL-C it's the selected text that is copied into the clipboard and pasted into Excel which isn't the intended behaviour.
Open the following URL in Microsoft Edge: https://snippet.webix.com/d839c82b, select a block of multiple columns, copy the data and paste into Excel to see an example of the wrong behaviour.
This seems to be a regression bug as the described issue isn't happening in Webix 5.0 and below in Microsoft Edge.