Form item white-space: nowrap causes long lines and a horizontal scrollbar

Let's review this a bit more, as this can affect different tables, because the rule tr.even .form-item is pretty general.

I am not sure, how this change affects input format guidelines, because on my clean D7 install, the guidelines are a list, not a table (see the attached image). Do I need some contrib modules, or specific config, to make that description a table affected by this CSS rule?

I cannot reproduce it on simplytest.me, with the Drupal 7 development snapshot.
I guess it could be caused by a module which changes how the input format help is rendered.

As we were unable to reproduce this, I am closing the issue. Feel free to reopen with more information if this is still an issue. Thanks!