Restitue le cas type initial à la fermeture de la courbe

src/lib/components/WaterfallView.svelte

@@ -189,14 +189,16 @@
     if (shared.savedSituation !== undefined) {
       situation = shared.savedSituation
       delete shared.savedSituation
-      if (shared.savedSituationIndex !== undefined)
+      if (shared.savedSituationIndex !== undefined) {
         shared.testCases[shared.savedSituationIndex] = situation
         delete shared.savedSituationIndex
       }
     }
+  }
 
   function requestAxesCalculation() {
     shared.savedSituation = situation
+    shared.savedSituationIndex = situationIndex
     situation = structuredClone($state.snapshot(situation))
     shared.testCases[situationIndex] = situation
     if (