front: setting power restrictions don't remove pathSteps

front/src/modules/powerRestriction/helpers/createPathStep.ts

@@ -75,6 +75,7 @@ const createPathStep = (
     ...trackOffset,
     // TODO: we should return the offset in mm once it is stored in mm in the store
     offset: mmToM(trackOffset.offset),
+    isFromPowerRestriction: true,
   };
 };
 
@@ -124,6 +125,7 @@ export const createCutAtPathStep = (
     id: nextId(),
     positionOnPath: cutAtPosition,
     coordinates: coordinatesAtCut,
+    isFromPowerRestriction: true,
     ...trackOffset,
     // TODO: we should return the offset in mm once it is stored in mm in the store
     offset: mmToM(trackOffset.offset),

front/src/reducers/osrdconf/operationalStudiesConf/utils.ts

@@ -95,7 +95,7 @@ export const cleanPathSteps = (
   powerRestrictions: PowerRestriction[]
 ): PathStep[] =>
   pathSteps.reduce((acc, pathStep, index) => {
-    if (index === 0 || index === pathSteps.length - 1) {
+    if (index === 0 || index === pathSteps.length - 1 || !pathStep.isFromPowerRestriction) {
       acc.push(pathStep);
       return acc;
     }

front/src/reducers/osrdconf/types.ts

@@ -89,6 +89,14 @@ export type PathStep = PathItemLocation & {
     trackNumber: number;
   };
   isInvalid?: boolean;
+  /** Flag specifying whether the pathStep was created from the power restriction selector or not
+   *
+   * If true, the pathStep might be cleaned if its power restriction is removed (except if it has time, stop or margin constraints)
+   *
+   * This flag will only work if the user has not saved their change. Once the change is saved, the flag will be removed and the pathStep
+   * will become permanent.
+   */
+  isFromPowerRestriction?: boolean;
 };
 
 export type StdcmPathStep = {