Regression curve: Make sure source curve for regression always is cre…

…ated

The regression curve is using the curve object as data source for regression. Make sure that the source curve is always created, and set uncheck based on curve visibility.

ApplicationLibCode/ProjectDataModel/Summary/RimEnsembleCurveSet.cpp

@@ -2117,8 +2117,7 @@ void RimEnsembleCurveSet::updateStatisticsCurves( const std::vector<RimSummaryCa
     RimSummaryCaseCollection* group = m_yValuesSummaryCaseCollection();
     RimSummaryAddress*        addr  = m_yValuesSummaryAddress();
 
-    if ( !isCurvesVisible() || m_disableStatisticCurves || !group ||
-         addr->address().category() == RifEclipseSummaryAddressDefines::SummaryCategory::SUMMARY_INVALID )
+    if ( m_disableStatisticCurves || !group || addr->address().category() == RifEclipseSummaryAddressDefines::SummaryCategory::SUMMARY_INVALID )
         return;
 
     // Calculate
@@ -2209,14 +2208,16 @@ void RimEnsembleCurveSet::updateStatisticsCurves( const std::vector<RimSummaryCa
         else
             summaryCase = m_ensembleStatCaseY.get();
 
-        for ( auto address : addresses )
+        for ( const auto& address : addresses )
         {
             auto curve = new RimSummaryCurve();
             curve->setParentPlotNoReplot( plot->plotWidget() );
             m_curves.push_back( curve );
             curve->setColor( m_statistics->color() );
             curve->setResampling( m_resampling() );
 
+            curve->setCheckState( isCurvesVisible() );
+
             if ( m_statisticsUseCustomAppearance() == AppearanceMode::DEFAULT )
             {
                 auto symbol = statisticsCurveSymbolFromAddress( address.summaryAddressY() );