Styling individual selections in the Datagrid selection model

[kgoo124]

Hi, I am one of the Cal Poly interns working on the Tabular Data Editor extension. We are looking to have some dashed borders around a cell when it has been copied, but not yet pasted. We have an issue here that has a picture of what we are looking to do.

It looks like all the potential Selections are stored in an array that is painted in datagrid.ts, but there is no way to isolate these selections. Some possible solutions would be using a CSS class and assigning a different render to a specific cell. The solution should be easily applied/removed. In our case, we would only want the dashed border to show up after copy, but before paste.