Fix test failure

src/gui/layout/qgslayoutnewitempropertiesdialog.cpp

@@ -61,7 +61,7 @@ void QgsLayoutItemPropertiesDialog::setItemPosition( QgsLayoutPoint position )
   position = mLayout->convertFromLayoutUnits( mLayout->pageCollection()->positionOnPage( layoutPoint ), position.units() );
 
   mPageSpin->setValue( page + 1 );
-  mPosUnitsComboBox->setUnit( position.units() );
+  whileBlocking( mPosUnitsComboBox )->setUnit( position.units() );
   mXPosSpin->setValue( position.x() );
   mYPosSpin->setValue( position.y() );
 }
@@ -80,7 +80,7 @@ void QgsLayoutItemPropertiesDialog::setItemSize( QgsLayoutSize size )
 {
   mWidthSpin->setValue( size.width() );
   mHeightSpin->setValue( size.height() );
-  mSizeUnitsComboBox->setUnit( size.units() );
+  whileBlocking( mSizeUnitsComboBox )->setUnit( size.units() );
 }
 
 QgsLayoutSize QgsLayoutItemPropertiesDialog::itemSize() const

tests/src/python/test_qgslayoutitempropertiesdialog.py

@@ -14,7 +14,7 @@
 
 import qgis  # NOQA
 
-from qgis.core import QgsUnitTypes, QgsLayoutSize, QgsLayoutPoint, QgsLayoutItem
+from qgis.core import QgsUnitTypes, QgsLayoutSize, QgsLayoutPoint, QgsLayoutItem, QgsProject, QgsLayout
 from qgis.gui import QgsLayoutItemPropertiesDialog
 
 from qgis.testing import start_app, unittest
@@ -28,6 +28,10 @@ def testGettersSetters(self):
         """ test dialog getters/setters """
         dlg = qgis.gui.QgsLayoutItemPropertiesDialog()
 
+        l = QgsLayout(QgsProject.instance())
+        l.initializeDefaults()
+        dlg.setLayout(l)
+
         dlg.setItemPosition(QgsLayoutPoint(5, 6, QgsUnitTypes.LayoutPixels))
         self.assertEqual(dlg.itemPosition().x(), 5.0)
         self.assertEqual(dlg.itemPosition().y(), 6.0)