WetGeek I'll wake up my hibernating Xfce laptop and check.
Lunch is thawing right now, so I'll poke this laptop and check now. This is a workspace where a Settings dialog takes up a fraction of the screen.
On the workspace where Vivaldi is running - and I'm typing this - I can't get a screen shot of Plank, as it hides as soon as I try to take a screenshot. But while it's still present, I can confirm that the area of the plank below Vivaldi is indeed red. To be clear, both the dot and the area of the plank around it are red.
Gotta go now. From the sounds from the kitchen, my burger has thawed now, and is frying with abandon.
