Index: sources/gui/qml/components/RangeSlider.qml
===================================================================
diff -u -r5d7dd96636bc7a647c61a43bb04ed25f5c2f6e7e -rdfb052718b359bf4204fe5572e2cd45aa7c562ec
--- sources/gui/qml/components/RangeSlider.qml	(.../RangeSlider.qml)	(revision 5d7dd96636bc7a647c61a43bb04ed25f5c2f6e7e)
+++ sources/gui/qml/components/RangeSlider.qml	(.../RangeSlider.qml)	(revision dfb052718b359bf4204fe5572e2cd45aa7c562ec)
@@ -318,15 +318,9 @@
     }
 
     function getColor(vIsActive, vIsValid) {
-        let color = Colors.textDisableButton
-        if ( vIsActive ) {
-            if ( vIsValid ) {
-                color = Colors.textMain
-            }
-            else {
-                color = Colors.createTreatmentInvalidParam
-            }
-        }
+        let color = Colors.textMain
+        if ( ! vIsValid     ) { color = Colors.createTreatmentInvalidParam  ; return color }
+        if ( ! vIsActive    ) { color = Colors.textDisableButton            ; return color }
         return color
     }