[PATCH] applets/notifications: don't allow horizontal scrolling

[PATCH] applets/notifications: don't allow horizontal scrolling

Notification bodies have their width constrained by the notification and
the horizontal scrollbar forced off, but they can still be scrolled with
a horizontal wheel, touchpad, or similiar. This is surprising and
pointless.

Instead explicitly set the contentWidth, which is otherwise ultimately
based on the underlying TextEdit (and that's the width it would have on
a single line without wrapping).

Gbp-Pq: Name upstream_2c27c9db_applets-notifications-don-t-allow-horizontal-scrolling.patch