When writing the qt6_qml_type_registration call, make sure to write
the set(QT_QML_MODULE_INSTALL_QMLTYPES TRUE) statement only if an
explicit path was provided via
QMLTYPES_INSTALL_DIR / QT_QML_MODULE_INSTALL_DIR.
This will remove the QT_QML_MODULE_INSTALL_QMLTYPES property from
many examples and tests in qtdeclarative, thus not installing the
.qmltypes file into the Qt prefix, thus polluting it.
Task-number: QTBUG-84403
Change-Id: I5c64d42915896d14f2591cbb64d73d912dbf7c7d
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>