Popups shows twice on each display
Does each display have its own Panel?
Yes
Seems like that may be expected then. But I'll let the Plasma folks weigh in.
I would expect that each panel should show it's popups on it's own monitor, not on both simultaneously.
Yes, I can understand to show just one popup in each monitor, but it doesn't make sense to show three popups on each of your three monitors of the very same notification. Its weird. Confirmed this happens since years, I would even say since plasma (I would bet it didn't happened on KDE). I've just opened a new proposal to let the user configure notifications a bit deeper (let's see what plasma devs think about this) https://bugs.kde.org/show_bug.cgi?id=402078 But anyway, I don't even want to imagine what kind of crazy hell must be to have six monitors and transfer a file xD
*** Bug 402078 has been marked as a duplicate of this bug. ***
The notification applet handles KUIServer integration as well as notifications. It's the KUIServer integration inside the applet that creates notifications about jobs. If you have two applets it creates two notifications. That part is a bug. (jobs.qml:104) Probably best to move the notification generation code out to somewhere shared, possibly the dataengine.
No longer happens with the awesome notifications rewrite that happened in Plasma 5.16. :)