[4.0.x] Notification popups are not full-width in landscape mode

A minor thing I noticed on SFOS 4.0 but don’t think warrants a bug report:

Popups do not span the full screen in landscape mode. Rather they are (not sure here) half-width or have the width of the shorter side of the screen, and are aligned to the left side.

Previous versions did not do that so I assume it’s an oversight rather than a design choice.