Remove group separator when editing numeric values

Fixes #19695 - Line Edit widgets for integer numbers with thousand separators enabled are hard to edit

Author: elpaso

src/gui/editorwidgets/qgstexteditwrapper.cpp

@@ -221,6 +221,15 @@ void QgsTextEditWrapper::setWidgetValue( const QVariant &val )
     v = field().displayString( val );
   }
 
+  // For numbers, remove the group separator that might cause validation errors
+  // when the user is editing the field value.
+  // We are checking for editable layer because in the form field context we do not
+  // want to strip the separator unless the layer is editable
+  if ( layer() && layer()->isEditable() && ! QLocale().groupSeparator().isNull() && ( field().type() == QVariant::Int || field().type() == QVariant::Double || field().type() == QVariant::LongLong ) )
+  {
+    v = v.remove( QLocale().groupSeparator() );
+  }
+
   if ( mTextEdit )
   {
     if ( val != value() )

src/gui/qgsattributeform.cpp

@@ -1463,6 +1463,12 @@ void QgsAttributeForm::init()
   connect( mLayer, &QgsVectorLayer::editingStarted, this, &QgsAttributeForm::synchronizeEnabledState );
   connect( mLayer, &QgsVectorLayer::editingStopped, this, &QgsAttributeForm::synchronizeEnabledState );
 
+  // This triggers a refresh of the form widget and gives a chance to re-format the
+  // value to those widgets that have a different representation when in edit mode
+  connect( mLayer, &QgsVectorLayer::editingStarted, this, [ = ] { setFeature( feature() ); } );
+  connect( mLayer, &QgsVectorLayer::editingStopped, this,  [ = ] { setFeature( feature() ); } );
+
+
   Q_FOREACH ( QgsAttributeFormInterface *iface, mInterfaces )
   {
     iface->initForm();