#6535 Update summary plot editor first time you uncheck a curve

ApplicationCode/UserInterface/RiuSummaryVectorSelectionUi.cpp

@@ -701,6 +701,9 @@ void RiuSummaryVectorSelectionUi::setSelectedCurveDefinitions( const std::vector
     }
 
     m_previouslySelectedSources = m_selectedSources.ptrReferencedObjects();
+
+    m_prevCurveCount    = allCurveDefinitionsFromSelection().size();
+    m_prevCurveSetCount = allCurveSetDefinitionsFromSelections().size();
 }
 
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