fixes #291

fixes #507

Sadly still required for replies, otherwise this would be perfect.

Limiting improves readability on wide monitors.

The immediate update of the settings is done by just exposing settings
as properties and then setting the settings as a context property.

In the future we should probably add a gradient when clipped...

This currently assumes the event, that is replied to, is already
fetched. If it isn't, it will render an empty reply. In the future we
should fetch replies before rendering them.

requires Qt5.12+

Text selection over multiple items doesn't work yet