Clicking expression button in stacked diagrams dialog crashes QGIS

[DelazJ]

What is the bug or the crash?

QGIS 3.41 on Windows, Qt6 (3cca51b)

1. Open a vector layer properties, Diagrams tab
2. Select "Stacked Diagram" then "pie chart" (but the sub-diagram type doesn't matter)
3. select one of the available fields and press "Edit expression" button.
4. KABOOM

Doing the same with a 3.41 build using Qt5 (edc5453) doesn't crash.

Steps to reproduce the issue

Report Details

Python Stack Trace

Windows fatal exception: stack overflow

Current thread 0x00003108 (most recent call first):
  <no Python frame>

Stack Trace

QgsCopcUpdate::readHierarchy :
QgsExpression::initFunctionHelp :
QgsExpression::initFunctionHelp :
QgsExpression::initFunctionHelp :
QgsExpression::initFunctionHelp :
QgsExpression::tags :
QgsExpressionTreeView::updateFunctionTree :
QgsExpressionTreeView::QgsExpressionTreeView :
QgsExpressionStoreDialog::label :
QgsExpressionBuilderWidget::QgsExpressionBuilderWidget :
QgsExpressionBuilderDialog::syncOkButtonEnabledState :
QgsExpressionBuilderDialog::QgsExpressionBuilderDialog :
QgsDiagramProperties::showExpressionBuilder :
QgsDiagramProperties::showAddAttributeExpressionDialog :
QgsMapLayerActionContext::operator= :
QgsActionMenu::feature :
QgsMapLayerActionRegistry::`default constructor closure' :
QgsActionMenu::feature :
pdal::PointView::layout :
QObject::qt_static_metacall :
QMetaObject::activate :
QAbstractButton::clicked :
QAbstractButton::click :
QAbstractButton::mouseReleaseEvent :
QWidget::event :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QApplicationPrivate::sendMouseEvent :
QWidgetRepaintManager::updateStaticContentsSize :
QWidgetRepaintManager::updateStaticContentsSize :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QGuiApplicationPrivate::processMouseEvent :
QWindowSystemInterface::sendWindowSystemEvents :
QEventDispatcherWin32::processEvents :
QWindowsGuiEventDispatcher::processEvents :
QEventLoop::exec :
QDialog::exec :
QgsStackedDiagramProperties::editSubDiagramRenderer :
QgsStackedDiagramProperties::editSubDiagramRenderer :
QgsStackedDiagramProperties::addSubDiagramRenderer :
QgsMapLayerActionContext::operator= :
QgsActionMenu::feature :
QgsMapLayerActionRegistry::`default constructor closure' :
QgsActionMenu::feature :
pdal::PointView::layout :
QObject::qt_static_metacall :
QMetaObject::activate :
QAbstractButton::clicked :
QAbstractButton::click :
QAbstractButton::mouseReleaseEvent :
QWidget::event :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QApplicationPrivate::sendMouseEvent :
QWidgetRepaintManager::updateStaticContentsSize :
QWidgetRepaintManager::updateStaticContentsSize :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QGuiApplicationPrivate::processMouseEvent :
QWindowSystemInterface::sendWindowSystemEvents :
QEventDispatcherWin32::processEvents :
QWindowsGuiEventDispatcher::processEvents :
QEventLoop::exec :
QDialog::exec :
QgisApp::showLayerProperties :
QgisApp::layerProperties :
QgisApp::layerTreeViewDoubleClicked :
pdal::operator< :
QgsAllLayersFeaturesLocatorFilter::hasConfigWidget :
QgisApp::cadDockWidget :
QgsAllLayersFeaturesLocatorFilter::hasConfigWidget :
QgsMapLayerStyleCommand::id :
QObject::qt_static_metacall :
QMetaObject::activate :
QAbstractItemView::doubleClicked :
QTreeView::mouseDoubleClickEvent :
QgsLayerTreeView::mouseDoubleClickEvent :
QWidget::event :
QFrame::event :
QAbstractItemView::viewportEvent :
QCoreApplicationPrivate::sendThroughObjectEventFilters :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QApplicationPrivate::sendMouseEvent :
QWidgetRepaintManager::updateStaticContentsSize :
QWidgetRepaintManager::updateStaticContentsSize :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QGuiApplicationPrivate::processMouseEvent :
QWindowSystemInterface::sendWindowSystemEvents :
QEventDispatcherWin32::processEvents :
QWindowsGuiEventDispatcher::processEvents :
QEventLoop::exec :
QCoreApplication::exec :
main :
BaseThreadInitThunk :
RtlUserThreadStart :

QGIS Info
QGIS Version: 3.41.0-Master
QGIS code revision: 3cca51b
Compiled against Qt: 6.8.1
Running against Qt: 6.8.1
Compiled against GDAL: 3.11.0dev-f82e76034c
Running against GDAL: 3.11.0dev-f82e76034c

System Info
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 10.0.19045

Versions

Version de QGIS	3.41.0-Master
Révision du code	3cca51bfc8
Libraries
Version de Qt	6.8.1
Version de Python	3.12.8
Version de GDAL/OGR	3.11.0dev-f82e76034c
Version de Proj	9.5.1
Version de la base de données du registre EPSG	v11.022 (2024-11-05)
Version de GEOS	3.13.0-CAPI-1.19.0
Version de SQLite	3.46.1
Version de PDAL	2.8.3
Version du client PostgreSQL	unknown
Version de SpatiaLite	5.1.0
Version de QWT	6.3.0
Version de QScintilla2	2.14.1
Version de l'OS	Windows 10 Version 22H2
Cette copie de QGIS dispose d'une sortie de débogage.
Extensions Python actives
db_manager	0.1.20
grassprovider	2.12.99
MetaSearch	0.3.6
processing	2.12.99

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[agiudiceandrea]

It looks like it may be the same or at least related to #59003.

[nicogodet]

Yup looks very similar.
I tried to investigate without success...