src/hooks/useImportWizard.test.ts

@@ -222,6 +222,34 @@ describe("wizardReducer — rootFiles (#427)", () => {
     const after = wizardReducer(before, { type: "SET_ERROR", payload: "folder not found" });
     expect(after.rootFiles).toBe(before.rootFiles);
   });
+
+  it("choosing another folder empties the root files until its own scan lands (#446)", () => {
+    const before = reduce([
+      { type: "SET_IMPORT_FOLDER", payload: "/releves" },
+      { type: "SET_SCANNED_SOURCES", payload: scan(["a.csv"]) },
+    ]);
+    const changed = wizardReducer(before, { type: "SET_IMPORT_FOLDER", payload: "/autre" });
+    // The warning would name "a.csv" of /releves under the name of /autre.
+    expect(changed.importFolder).toBe("/autre");
+    expect(changed.rootFiles).toEqual([]);
+    // Prior behaviour, kept: the sources of the last scan stay until the new one.
+    expect(changed.scannedSources).toBe(before.scannedSources);
+
+    const scanned = wizardReducer(changed, { type: "SET_SCANNED_SOURCES", payload: scan(["b.csv"], []) });
+    expect(scanned.rootFiles).toEqual(["b.csv"]);
+    expect(scanned.scannedSources).toEqual([]);
+  });
+
+  it("a scan error after a folder change names no root file of the previous folder (#446)", () => {
+    const after = reduce([
+      { type: "SET_IMPORT_FOLDER", payload: "/releves" },
+      { type: "SET_SCANNED_SOURCES", payload: scan(["a.csv"]) },
+      { type: "SET_IMPORT_FOLDER", payload: "/autre" },
+      { type: "SET_LOADING", payload: true },
+      { type: "SET_ERROR", payload: "folder not found" },
+    ]);
+    expect(after.rootFiles).toEqual([]);
+  });
 });
 
 describe("sampleFolderError — the refusals of create_sample_import_folders (#384, D2)", () => {

src/hooks/useImportWizard.ts

@@ -110,9 +110,11 @@ export interface WizardState {
   /**
    * Names of the CSV/TXT files placed directly at the root of the import
    * folder, which no source reads (#427). Set with `scannedSources` by the
-   * same action, so the warning and the source list always come from the same
+   * same action, so the warning and the source list come from the same scan;
-   * scan; kept by `RESET` like them. Shown on screen only, never logged: a
+   * kept by `RESET` like them. Emptied by `SET_IMPORT_FOLDER`, which leaves
-   * statement name often carries an account number.
+   * `scannedSources` alone (#446): another folder shows no warning until its
+   * own scan. Shown on screen only, never logged: a statement name often
+   * carries an account number.
    */
   rootFiles: string[];
   selectedSource: ScannedSource | null;
@@ -252,8 +254,12 @@ export function wizardReducer(state: WizardState, action: WizardAction): WizardS
     case "SET_STEP":
       return { ...state, step: action.payload };
     case "SET_IMPORT_FOLDER":
-      // The sample-folder banner describes the previous folder: drop it.
+      // The sample-folder banner describes the previous folder: drop it. So do
-      return { ...state, importFolder: action.payload, sampleCreated: null };
+      // the root files (#446): until the new folder's scan lands, or for good
+      // if it fails, the warning would name the previous folder's files under
+      // the new folder's name. The scanned sources stay until that scan, as
+      // they always did.
+      return { ...state, importFolder: action.payload, rootFiles: [], sampleCreated: null };
     case "SET_IMPORT_FOLDER_LOADED":
       return { ...state, importFolderLoaded: true };
     case "SET_SCANNED_SOURCES":