fix: reset visible run logs for new runs

tests/test_gui.py

@@ -1150,7 +1150,7 @@ class GuiTests(TempDirMixin, unittest.TestCase):
 
         self.assert_removed(temp_dir)
 
-    def test_generate_tab_loads_latest_generate_run_log(self):
+    def test_generate_tab_does_not_auto_mix_latest_generate_run_log(self):
         with self.make_temp_dir() as temp_dir:
             cfg = self.make_config(temp_dir)
             db.init_db(cfg["db_path"])
@@ -1173,11 +1173,94 @@ class GuiTests(TempDirMixin, unittest.TestCase):
             tab = GenerateTab(config=cfg)
             self.addCleanup(tab.close)
 
+            text = tab.run_log_view.toPlainText()
             self.assertEqual("generateRunLogView", tab.run_log_view.objectName())
-            self.assertIn("phase=cover step=cover_request result=failed", tab.run_log_view.toPlainText())
+            self.assertIn("本轮日志会在开始运行后显示", text)
+            self.assertNotIn("phase=cover step=cover_request result=failed", text)
 
         self.assert_removed(temp_dir)
 
+    def test_generate_tab_start_generate_resets_visible_log_for_current_run(self):
+        with self.make_temp_dir() as temp_dir:
+            cfg = self.make_config(temp_dir)
+            accounts.create_account("主店", "alias-a", debug_port=9222, config=cfg)
+            batch_id = db.create_batch(["input.xlsx"], path=cfg["db_path"])
+            db.insert_tasks(
+                batch_id,
+                [
+                    {
+                        "source_file_abs": os.path.join(temp_dir, "input.xlsx"),
+                        "source_sheet": "商品",
+                        "source_row": 2,
+                        "account_name": "Excel主店",
+                        "alias": "alias-a",
+                        "item_id": "51100639510",
+                    }
+                ],
+                path=cfg["db_path"],
+            )
+            task = db.list_tasks(batch_id=batch_id, path=cfg["db_path"])[0]
+            db.set_collected(task.id, "旧标题", "old.jpg", path=cfg["db_path"])
+            tab = GenerateTab(config=cfg)
+            self.addCleanup(tab.close)
+            tab.run_log_view.setPlainText("上一轮失败日志")
+
+            class FakeSignal:
+                def __init__(self):
+                    self.callbacks = []
+
+                def connect(self, callback):
+                    self.callbacks.append(callback)
+
+            class FakeThread:
+                def __init__(self):
+                    self.finished = FakeSignal()
+                    self.started = False
+
+                def start(self):
+                    self.started = True
+
+            fake_thread = FakeThread()
+            with mock.patch("app.gui.run_worker", return_value=fake_thread):
+                tab.start_generate()
+
+            text = tab.run_log_view.toPlainText()
+            self.assertTrue(fake_thread.started)
+            self.assertNotIn("上一轮失败日志", text)
+            self.assertIn("本轮AI生成开始：任务 1 条", text)
+            self.assertIn("生成封面：否", text)
+
+        self.assert_removed(temp_dir)
+
+    def test_apply_tab_does_not_auto_mix_latest_apply_run_log(self):
+        with self.make_temp_dir() as temp_dir:
+            cfg = self.make_config(temp_dir)
+            db.init_db(cfg["db_path"])
+            run_id = db.create_run_log("apply", total=1, path=cfg["db_path"])
+            db.add_run_log_event(
+                run_id,
+                "step=apply_update result=failed detail=上一轮更新失败",
+                level="error",
+                path=cfg["db_path"],
+            )
+            db.finish_run_log(
+                run_id,
+                status="done",
+                done=1,
+                failed_count=1,
+                summary_json={"failed": 1},
+                path=cfg["db_path"],
+            )
+
+            tab = ApplyTab(config=cfg)
+            self.addCleanup(tab.close)
+
+            text = tab.run_log_view.toPlainText()
+            self.assertEqual("applyRunLogView", tab.run_log_view.objectName())
+            self.assertIn("本轮日志会在开始运行后显示", text)
+            self.assertNotIn("step=apply_update result=failed", text)
+
+        self.assert_removed(temp_dir)
     def test_apply_tab_lists_generated_tasks_and_filters_by_batch_shop_status(self):
         with self.make_temp_dir() as temp_dir:
             cfg = self.make_config(temp_dir)
@@ -1437,6 +1520,7 @@ class GuiTests(TempDirMixin, unittest.TestCase):
             statuses = []
             tab = ApplyTab(config=cfg, status_callback=statuses.append)
             self.addCleanup(tab.close)
+            tab.run_log_view.setPlainText("上一轮更新失败")
 
             class FakeSignal:
                 def __init__(self):
@@ -1469,6 +1553,9 @@ class GuiTests(TempDirMixin, unittest.TestCase):
             self.assertFalse(tab.apply_worker.dry_run)
             self.assertFalse(tab.apply_worker.parallel_accounts)
             self.assertEqual(1, tab.apply_worker.batch_size)
+            log_text = tab.run_log_view.toPlainText()
+            self.assertNotIn("上一轮更新失败", log_text)
+            self.assertIn("本轮更新开始：任务 1 条，每批 1 条", log_text)
             self.assertFalse(tab.preview_update_button.isEnabled())
             self.assertFalse(tab.start_update_button.isEnabled())
             self.assertTrue(tab.stop_update_button.isEnabled())
@@ -1515,6 +1602,7 @@ class GuiTests(TempDirMixin, unittest.TestCase):
             statuses = []
             tab = ApplyTab(config=cfg, status_callback=statuses.append)
             self.addCleanup(tab.close)
+            tab.run_log_view.setPlainText("上一轮检查失败")
 
             class FakeSignal:
                 def __init__(self):
@@ -1543,6 +1631,9 @@ class GuiTests(TempDirMixin, unittest.TestCase):
             self.assertTrue(tab.apply_worker.dry_run)
             self.assertTrue(tab.apply_worker.parallel_accounts)
             self.assertEqual(2, tab.apply_worker.max_parallel_accounts)
+            log_text = tab.run_log_view.toPlainText()
+            self.assertNotIn("上一轮检查失败", log_text)
+            self.assertIn("本轮检查开始：任务 1 条，每批 1 条", log_text)
             self.assertEqual("开始检查本轮更新：1 条", statuses[-1])
 
         self.assert_removed(temp_dir)