End Session Dialog should pull visual focus

[kurisubrooks]

Hi all, was chatting with someone in the community slack today and came across a difference between pantheon and gnome that i thought weird to be removed given its purpose.

In terms of the Shutdown dialog (EndSessionDialog), I was wondering why the black overlay that would be placed under the dialog to pull focus to the modal was removed. It aided in bringing focus to the modal that can potentially be a destructive action (as is currently represented by the red accent colour on the shutdown button), as well as increase contrast between the foreground and the background.

It was just something interesting that I noticed, but I wonder if it's something that you'd consider adding to Pantheon. Made a quick mockup as you can see below of the current design vs proposed.

Current vs Proposed:

Thanks for your consideration~

[danirabbit]

Blocked waiting for elementary/gala#1974