The old code connected to the wrong signal and therefore had to write
a custom slot to perform the disabling of the group-box.
The new code simply connects the QCheckBox::toggled(bool) signal to
the directly-compatible QWidget::setDisabled(bool) slot, removing the
need for a custom slot.
Also move the connection into the .ui file, so it works already when
checking the form in QtDesigner.
Amends 2690822428, which, however, only
inherited the issues from older code.
Pick-to: 6.9 6.8
Change-Id: Ia834f92de270bb7b18981273188f6e5b6cd457a2
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
53826d1cde