Each time a notification appears in systray (from receiving a mail in KMail or other application that generates one), in system journal we can see:
janv. 02 20:45:32 mageia.local plasmashell: file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/NotificationPopup.qml:116:15: QML QQuickItem: Binding loop detected for property "height"
STEPS TO REPRODUCE
1. Receive a notification like new mail from KMail
2. See system log
Notification displayed with warning logged in system log, subtle delay to display the notification as it creates a journal entry.
Notification displayed without delay and no warning.
Upstream bug report: https://bugs.kde.org/show_bug.cgi?id=431080
No fix for now.
I should reread my BR before send an other one... Sorry. Dup.
*** This bug has been marked as a duplicate of bug 28215 ***