[Development] QtQuick Layout behavior changes?

[Nicolas Fella]

Hi,

after updating my local Qt 6.7 + KDE build I noticed a number of severe
UI bugs in various QML-based programs (Plasma, System Settings, several
applications) where certain elements are wrongly sized. Investigating
lead me to https://bugreports.qt.io/browse/QTBUG-117597, which suggests
to me that there is a deliberate change in the behavior of layouts
causing these issues. Surely this can't be the case, can it? This would
cause countless regressions in the UI of just about every piece of QML
software written before this change and completely go against Qt's
stability guarantees. Could someone please shed some light on this and
explain whether I'm misunderstanding the situation or there is a massive
breaking change coming our way?

Cheers

Nico