Details
-
Bug
-
Resolution: Fixed
-
P1: Critical
-
6.7
-
None
-
Fedora 39
-
933f80f34 (dev), 18aeb7177 (6.7), 5eba40805 (dev), 3668db06e (6.7)
Description
KDE Plasma's systemsettings application fails to load QML-based modules using Qt 6.7 due to the following QML error:
qrc:/kcm/kcm_landingpage/main.qml:18 Type KCM.SimpleKCM unavailable qrc:/qt/qml/org/kde/kcmutils/SimpleKCM.qml:33 Type Kirigami.ScrollablePage unavailable qrc:/qt/qml/org/kde/kirigami/ScrollablePage.qml:68 Type Kirigami.Page unavailable qrc:/qt/qml/org/kde/kirigami/Page.qml:237 Type Kirigami.PageRow unavailable qrc:/qt/qml/org/kde/kirigami/PageRow.qml:180 Type OverlayDrawer unavailable file:///home/nico/kde/usr/qml/org/kde/kirigami/OverlayDrawer.qml:22 Type KT.OverlayDrawer unavailable file:///home/nico/kde/usr/qml/org/kde/kirigami/templates/OverlayDrawer.qml:120 Cannot assign object of type "IconPropertiesGroup" to property of type "IconPropertiesGroup_QMLTYPE_55*" as the former is neither the same as the latter nor a sub-class of it.
This seems to be due to its somewhat complex architecture: There is a QML-based sidebar (using QQuickWidget) in a QMainWindow. The QML code is added via qt_add_qml_module. The actual module content is in another QQuickWidget, loaded from a plugin that ships the QML code via qrc but not using qt_add_qml_module.
Additionally both import components from Kirigami. Kirigami uses the qmlRegisterType(QUrl ...) function to register its controls. The combination of these factors makes the bug appear.
https://invent.kde.org/nicolasfella/qml-test is a minimal example showing the problem. Loading the second component fails with
qrc:/qt/qml/org/kde/systemsettings/Main.qml:4 Type Comps.OverlayDrawer unavailable file:///home/nico/qml-test/OverlayDrawer.qml:4 Cannot assign object of type "IconPropertiesGroup" to property of type "IconPropertiesGroup_QMLTYPE_1*" as the former is neither the same as the latter nor a sub-class of it.
This is tested with current 6.7 branch (qtbase 32fa63f650be5b2d5d2c219d9150f994c761bd75, qtdeclarative ac0bbf86c979ab3faef102890ceaceb0378f8ed4). It worked fine with Qt 6.6 and previous
Attachments
Issue Links
- relates to
-
-
- Closed
-
| For Gerrit Dashboard: QTBUG-120189 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 526941,11 | QtQml: Move engine-specific data out of base compilation unit | dev | qt/qtdeclarative | Status: MERGED | +2 | 0 |
| 526990,2 | WIP: Move non-engine-specific members out of ExecutableCompilationUnit | dev | qt/qtdeclarative | Status: ABANDONED | -2 | 0 |
| 527526,16 | WIP: QtQml: Always check the type registry before loading types | dev | qt/qtdeclarative | Status: ABANDONED | -2 | 0 |
| 528358,1 | QtQml: Clean up intercepted and final URLs | dev | qt/qtdeclarative | Status: DEFERRED | 0 | 0 |
| 529019,2 | QtQml: Move engine-specific data out of base compilation unit | 6.7 | qt/qtdeclarative | Status: MERGED | +2 | 0 |
| 529215,2 | QtQml: Do detour through the CU for building property caches | dev | qt/qtdeclarative | Status: MERGED | +2 | 0 |
| 529625,2 | QtQml: Do detour through the CU for building property caches | 6.7 | qt/qtdeclarative | Status: MERGED | +2 | 0 |