Preview banner needs to adapt to release schedule
https://invent.kde.org/plasma/plasma-workspace/-/blob/master/shell/desktopview.cpp#L201
Alpha, 5.80.0
Beta 1, 5.90.0
Beta 2, 5.91.0
RC1, 5.92.0
RC2, 5.93.0
https://invent.kde.org/plasma/plasma-workspace/-/blob/master/shell/desktopview.cpp#L201
Alpha, 5.80.0
Beta 1, 5.90.0
Beta 2, 5.91.0
RC1, 5.92.0
RC2, 5.93.0