The combination of[1]
#guider_overlay { /*...*/ z-index: 10; }
and[2]
#p-personal { /* ... */ z-index: 100; }
causes GuidedTour to highlight Echo's #pt-notifications when a step of a tour has "overlay: true". I tested this at [3].
[2] https://github.com/wikimedia/mediawiki-core/blob/master/skins/vector/screen.less#L77
[3] https://pt.wikipedia.org/wiki/Especial:Contribui%C3%A7%C3%B5es/Aleph_Bot?tour=contribs
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=64788