Weird looking borders when a view doesn't use bulk operations

This needs a review @ilkkave 👀

Thanks for the patch. The "admin/content" view looks now good with it.

I also tried the patch with Webform module, and there seems to be still so problems with listings provided by it, at least with the following ones:

Webforms listing →
Webform results →
Webforms: Variants configuration →

Refactored the integration a bit, this needs another review 👀

(sorry for the commit noise here – tried out Zed and didn't had the correct editorconfig enabled hence the commits to fix the indents)

Thanks. Confirming that works now with Webform listings too.