Merge pull request #8266 from elpaso/bugfix-20180-doublespinbox-crash

Do not delete the clear action (and don't crash)

Author: elpaso

src/app/qgssnappingwidget.cpp

@@ -201,7 +201,10 @@ QgsSnappingWidget::QgsSnappingWidget( QgsProject *project, QgsMapCanvas *canvas,
   mTracingOffsetSpinBox->setRange( -1000000, 1000000 );
   mTracingOffsetSpinBox->setDecimals( 6 );
   mTracingOffsetSpinBox->setClearValue( 0 );
-  mTracingOffsetSpinBox->setClearValueMode( QgsDoubleSpinBox::CustomValue );
+  mTracingOffsetSpinBox->setClearValueMode( QgsDoubleSpinBox::ClearValueMode::CustomValue );
+  // Note: set to false to "fix" a crash
+  // See https://github.com/qgis/QGIS/pull/8266 for some more context
+  mTracingOffsetSpinBox->setShowClearButton( false );
   QMenu *tracingMenu = new QMenu( this );
   QWidgetAction *widgetAction = new QWidgetAction( tracingMenu );
   QVBoxLayout *tracingWidgetLayout = new QVBoxLayout;