Category should be highlighted if it contains groups with unread messages

[Biep]

Groups with unread messages may be hidden below the fold. If the header ('People', 'Rooms', 'Low Priority', ...) were highlighted, such messages would still have a marker.

[turt2live]

The badge is already added to the header. Is there something more you're after?

[t3chguy]

thats for notifications, which may not include unreads (bolds) depending on settings

[turt2live]

it also brings up the unread notifications. Bold rooms are indeed a different story, but the theory at that point is why would you want to see the tag decorated if you've selected such a low-noise option?

[aaronraimist]

If https://github.com/vector-im/riot-web/issues/3374 was an option then I wouldn't have to set every room to mentions only

[Biep]

It is nice to be able to discern various levels of importance. On the lowest level, I want no badges, but I'd still want to be reminded there is something.

[turt2live]

The sublist header now has a badge.