snapping dialog: block signals when reloading snapping options

QgsProject: also apply default when property is not available and not only if
an existing one is invalid

fixes #12192

Author: jef-n

python/core/qgsproject.sip

@@ -132,36 +132,6 @@ class QgsProject : QObject
     bool write();
     //@}
 
-
-    /// syntactic sugar for property lists
-    // DEPRECATED typedef QPair< QString, QVariant >  PropertyValue;
-    // DEPRECATED typedef QValueList< PropertyValue > Properties;
-
-    /** extra properties, typically added by plug-ins
-
-       This allows for extra properties to be associated with projects.  Think
-       of it as a registry bound to a project.
-
-       Properties are arbitrary values keyed by a name and associated with a
-       scope.  The scope would presumably refer to your plug-in.
-       E.g., "openmodeller".
-
-       @note
-
-       E.g., open modeller might use:
-
-       <code>"QgsProject::instance()->properties("openmodeller")["foo"]</code>.
-
-       @todo "properties" is, overall, a good name; but that might imply that
-       the qgis specific state properites are different since they aren't
-       accessible here.  Actually, what if we make "qgis" yet another
-       scope that stores its state in the properties list?  E.g.,
-       QgsProject::instance()->properties()["qgis"]?
-
-
-     */
-    // DEPRECATED Properties & properties( QString const & scope );
-
     /**
        removes all project properties
 

src/app/qgssnappingdialog.cpp

@@ -133,15 +133,21 @@ void QgsSnappingDialog::reload()
     idx = 0;
   else // off
     idx = 3;
+  mDefaultSnapToComboBox->blockSignals( true );
   mDefaultSnapToComboBox->setCurrentIndex( idx );
+  mDefaultSnapToComboBox->blockSignals( false );
 
   double tolerance = settings.value( "/qgis/digitizing/default_snapping_tolerance", 0 ).toDouble();
   tolerance = QgsProject::instance()->readDoubleEntry( "Digitizing", "/DefaultSnapTolerance", tolerance );
+  mDefaultSnappingToleranceSpinBox->blockSignals( true );
   mDefaultSnappingToleranceSpinBox->setValue( tolerance );
+  mDefaultSnappingToleranceSpinBox->blockSignals( false );
 
   int unit = settings.value( "/qgis/digitizing/default_snapping_tolerance_unit", QgsTolerance::ProjectUnits ).toInt();
   unit = QgsProject::instance()->readNumEntry( "Digitizing", "/DefaultSnapToleranceUnit", unit );
+  mDefaultSnappingToleranceComboBox->blockSignals( true );
   mDefaultSnappingToleranceComboBox->setCurrentIndex( unit == QgsTolerance::Pixels ? 1 : 0 );
+  mDefaultSnappingToleranceComboBox->blockSignals( false );
 
   mLayerTreeWidget->clear();
 
@@ -202,7 +208,6 @@ void QgsSnappingDialog::closeEvent( QCloseEvent* event )
   }
 }
 
-
 void QgsSnappingDialog::apply()
 {
   QString snapMode;
@@ -492,12 +497,13 @@ void QgsSnappingDialog::setIntersectionSnappingState()
 
 void QgsSnappingDialog::setSnappingMode()
 {
+  mSnapModeComboBox->blockSignals( true );
   QString snapMode = QgsProject::instance()->readEntry( "Digitizing", "/SnappingMode" );
   if ( snapMode == "current_layer" )
     mSnapModeComboBox->setCurrentIndex( 0 );
   else if ( snapMode == "all_layers" )
     mSnapModeComboBox->setCurrentIndex( 1 );
   else // "advanced" or empty (backward compatibility)
     mSnapModeComboBox->setCurrentIndex( 2 );
+  mSnapModeComboBox->blockSignals( false );
 }
-