drush core-requirements does not output descriptions in render arrays

[pfrenssen]

In issue #2296929: Clean up system_install() SafeMarkup::set() use it was discovered by herved that drush rq does not output descriptions that are rendered with render arrays correctly. Instead it shows Array.

This is because the concatenate-columns option is used to format the table. This treats the input data as strings and simply concatenates them.

The table formatter actually expects all input data to be raw strings. To make it possible to use arrays and objects in the input data we could provide a callback function that preprocesses the data of particular columns before trying to format it. This would solve it in a generic way.

[AdamPS]

Thanks @weitzman I think this is now fixed and ready to close.