Registra spento sul frame gia' registrato, nuovo grab dopo il reset

Refs #123

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/frontend/flask_app/static/js/vision_execute.js

@@ -32,6 +32,7 @@ function visionExecute() {
     preview: false,    // result on screen is an analysis only, not saved
     saved: false,      // «Registra» done: the saved result replaces the preview
     lastBlob: null,    // last frame shown, the one «Registra» saves
+    recordedBlob: null, // #123: frame saved by the last successful «Registra»: not recordable twice
     paused: false,     // operator paused the in-line loop
     registering: false, // «Registra» in progress: the loop stands still
     leaving: false,    // page is being left: no more requests
@@ -43,8 +44,10 @@ function visionExecute() {
       // #120: «Rimisura»/nuovo ciclo (task-result-reset): il pezzo va registrato di nuovo, anche senza camera
       window.addEventListener('task-result-reset', () => {
         this.saved = false;
-        this.preview = !!this.result;
+        // #123: il frame gia' registrato non e' piu' un'anteprima ne' si registra due volte
-        this.kick();
+        this.preview = !!this.result && this.lastBlob !== this.recordedBlob;
+        // #123: camera impulsiva = frame nuovo subito (come all'apertura); in linea riparte il ciclo
+        if (this.hasCamera && !this.inLinea) this.grab(); else this.kick();
       });
       if (!this.hasCamera) return;
       document.addEventListener('visibilitychange', () => { if (!document.hidden) this.kick(); });
@@ -58,7 +61,7 @@ function visionExecute() {
     get hasCamera() { return !!(window.__visionCfg || {}).cameraAvailable; },
     get inLinea() { return this.hasCamera && (window.__visionCfg || {}).modo === 'in_linea'; },
     // «Registra» needs a frame on screen that is not saved yet
-    get canRecord() { return !!this.lastBlob && !this.saved && !this.registering; },
+    get canRecord() { return !!this.lastBlob && this.lastBlob !== this.recordedBlob && !this.saved && !this.registering; },  // #123: non sul frame gia' registrato
 
     shouldRun() {
       return this.inLinea && !this.paused && !this.saved && !this.registering
@@ -145,6 +148,7 @@ function visionExecute() {
         if (!this.error && this.result && this.result.vision_result_id) {
           this.preview = false;
           this.saved = true;
+          this.recordedBlob = blob;   // #123: questo frame e' registrato, Registra resta spento finche' non ne arriva uno nuovo
           this._emitRecorded();   // #120: la pagina conta le quote registrate
         }
       } finally {

src/frontend/flask_app/tests/js/test_vision_rows.js

@@ -175,6 +175,26 @@ c5.acquire = async function () { this.result = { vision_result_id: 7, measuremen
   h();
   check('#120 task-result-reset: saved = false', c5.saved === false);
 
+  // #123: dopo Registra + task-result-reset Registra e' spento sul frame registrato, anteprima spenta, impulsiva = grab
+  win.__visionCfg = { cameraAvailable: true, modo: 'impulsiva', subtasks: [] };
+  const c9 = ctx.visionExecute();
+  let grabs = 0;
+  c9.grab = async function () { grabs++; };
+  c9.lastBlob = { name: 'f1' };
+  c9.acquire = async function () { this.result = { vision_result_id: 11, measurements: okMs }; };
+  check('#123 prima di Registra: canRecord', c9.canRecord === true);
+  await c9.record();
+  check('#123 dopo Registra: canRecord falso (saved)', c9.canRecord === false && c9.recordedBlob === c9.lastBlob);
+  c9.$nextTick = () => {};   // #123: nel test nessun grab di apertura
+  c9.init();   // registra l'ascolto di task-result-reset
+  grabs = 0;
+  (listeners['task-result-reset'] || []).slice(-1)[0]();
+  check('#123 reset sul frame registrato: canRecord falso', c9.canRecord === false && c9.saved === false);
+  check('#123 reset sul frame registrato: niente badge anteprima', c9.preview === false);
+  check('#123 reset in impulsiva: un solo grab', grabs === 1, String(grabs));
+  c9.lastBlob = { name: 'f2' };
+  check('#123 frame nuovo: canRecord vero', c9.canRecord === true);
+
   // #119 #122: saveName = titolo del task (nome proposto da <tmf-viewer save-name>), 'immagine' se manca
   win.__visionCfg = { taskName: 'Roto3', subtasks: [] };
   check('#122 saveName = nome del task', ctx.visionExecute().saveName === 'Roto3');