Datatable rendered column references wrong content

[ecircenis]

If I create a screen in designer with a datatable containing rendered columns and then make a copy of the screen, the table on the second screen references the render boxes from the first screen instead of from the second.

Also, to get around this, I had to rename the rendered property name. Changing the name does not change the name of the render box. You also have to uncheck and re-check render. But, then you end up with two render boxes: one with the old name and one with the new. The old cannot be deleted. Seems like this entire experience can be improved.

[ericsoderberghp]

Made the canvas more resilient to scenarios like this so the designer doesn't go blank in 0829d9a.

Still need to address DataTable column render components when copying a screen.