Set AllowAllArgumentsOnNextLine to false
Discussion in plasma/plasma-workspace!381 (comment 132887)
This is a bit more controversial, but in most cases it prevents uglification.
See a diff of pw, before this value was not set:
file.diff
The only alternative we would have is to exclude these lines from the formatting or to do it this way:
QDBusMessage msg = QDBusMessage::createMethodCall(
QStringLiteral("org.kde.plasmashell"),//
QStringLiteral("/org/kde/osdService"),//
QStringLiteral("org.kde.osdService"),//
QStringLiteral("showText")
);
But IMHO this does not look good.