Buttons: wrong text color on focus

[afercia]

Both Publish buttons have a wrong color when focused (i.e. when navigating with the keyboard and they get focus). Probably related to recent work on buttons. /Cc @jasmussen

Worth also noting there's a great variety of focus styles now, not sure if that's intentional. See the buttons below (all with forced focus via browser's dev tools):

[afercia]

Seems this is not limited to the Publish buttons:

[nfmohit]

Seems this is not limited to the Publish buttons:

@afercia Just FYI, #6714 should address those and any other buttons having the .button-primary class as well.

Screenshot:

Thank you!

[jasmussen]

I've noticed this too, and I've promised to help @youknowriad with #6562, which should fix this. So I've assigned myself. However I've got a bit too much on my plate these days, so I can't promise I'll make it for 2.9, so if anyone else would like to patch this in the mean time, they should feel free to.