fix(gui): keep cover candidate controls below images

tests/test_gui.py

@@ -181,6 +181,38 @@ class GuiTests(TempDirMixin, unittest.TestCase):
         self.assertTrue(image.save(path))
         return path
 
+    def assert_cover_candidate_cards_do_not_overlap(self, dialog, check_horizontal=True):
+        previous_right = None
+        maximum_card_height = 0
+        for candidate_path in dialog.candidates:
+            card = dialog.candidate_items[candidate_path]
+            layout = card.layout()
+            thumbnail = layout.itemAt(0).widget()
+            radio = layout.itemAt(1).widget()
+            meta = layout.itemAt(2).widget()
+            spacing = max(0, layout.spacing())
+
+            self.assertGreaterEqual(
+                radio.geometry().top(),
+                thumbnail.geometry().bottom() + 1 + spacing,
+            )
+            self.assertGreaterEqual(
+                meta.geometry().top(),
+                radio.geometry().bottom() + 1 + spacing,
+            )
+            self.assertGreaterEqual(card.minimumHeight(), layout.sizeHint().height())
+            self.assertGreaterEqual(card.height(), meta.geometry().bottom() + 1)
+            if check_horizontal and previous_right is not None:
+                self.assertGreaterEqual(
+                    card.geometry().left(),
+                    previous_right + 1 + dialog.candidate_layout.spacing(),
+                )
+            previous_right = card.geometry().right()
+            maximum_card_height = max(maximum_card_height, card.height())
+
+        self.assertGreaterEqual(dialog.candidate_content.minimumHeight(), maximum_card_height)
+        self.assertGreaterEqual(dialog.candidate_content.height(), maximum_card_height)
+
     def _cover_gallery_task(self, temp_dir, generate_cover=True):
         cfg = self.make_config(temp_dir)
         cfg.setdefault("ai", {})["generate_cover"] = bool(generate_cover)
@@ -4205,6 +4237,77 @@ class GuiTests(TempDirMixin, unittest.TestCase):
 
         self.assert_removed(temp_dir)
 
+    def test_cover_gallery_arrow_switch_syncs_full_candidate_card_geometry(self):
+        with self.make_temp_dir() as temp_dir:
+            cfg, account, tasks, canonicals, archives = self._cover_gallery_task_set(
+                temp_dir,
+                count=2,
+            )
+            os.remove(archives[0])
+            second_prefix = os.path.splitext(canonicals[1])[0]
+            long_candidate = self.write_test_image(
+                f"{second_prefix}_20260709101100_候选图片文件名很长用于验证自适应布局.jpg"
+            )
+            self.write_test_image(f"{second_prefix}_20260709101200.jpg")
+            broken_candidate = f"{second_prefix}_20260709101300.jpg"
+            with open(broken_candidate, "wb") as file_handle:
+                file_handle.write(b"not-an-image")
+
+            dialog = CoverGalleryDialog(
+                tasks[0],
+                cfg["image_dir"],
+                cfg["db_path"],
+                account=account,
+                visible_tasks=tasks,
+                task_index=0,
+                account_by_alias={"alias-a": account},
+            )
+            self.addCleanup(dialog.close)
+            dialog.resize(1100, 700)
+            dialog.show()
+            QApplication.processEvents()
+            dialog._candidate_resize_timer.stop()
+            dialog._update_candidate_thumbnail_layout()
+            initial_thumbnail_size = dialog.candidate_thumbnail_size
+            dialog.next_button.setFocus()
+            down_event = QKeyEvent(QKeyEvent.KeyPress, gui.Qt.Key_Down, gui.Qt.NoModifier)
+
+            QApplication.sendEvent(dialog.next_button, down_event)
+
+            self.assertTrue(down_event.isAccepted())
+            self.assertEqual(tasks[1].id, dialog.task.id)
+            self.assertGreaterEqual(len(dialog.candidates), 5)
+            self.assertLess(dialog.candidate_thumbnail_size, initial_thumbnail_size)
+            self.assertEqual(0, dialog.candidate_scroll.horizontalScrollBar().value())
+            self.assert_cover_candidate_cards_do_not_overlap(dialog, check_horizontal=False)
+            self.assertEqual("图片读取失败", dialog.candidate_thumbnails[broken_candidate].text())
+            self.assertNotEqual(
+                os.path.basename(long_candidate),
+                dialog.candidate_buttons[long_candidate].text(),
+            )
+            self.assertIn(
+                os.path.basename(long_candidate),
+                dialog.candidate_buttons[long_candidate].toolTip(),
+            )
+
+            QApplication.processEvents()
+            dialog._candidate_resize_timer.stop()
+            dialog._update_candidate_thumbnail_layout()
+            QApplication.processEvents()
+            self.assert_cover_candidate_cards_do_not_overlap(dialog)
+
+            horizontal_bar = dialog.candidate_scroll.horizontalScrollBar()
+            self.assertGreater(horizontal_bar.maximum(), 0)
+            horizontal_bar.setValue(horizontal_bar.maximum())
+            self.assertGreater(horizontal_bar.value(), 0)
+            self.assertTrue(dialog.switch_task(-1))
+            self.assertEqual(0, horizontal_bar.value())
+            self.assert_cover_candidate_cards_do_not_overlap(dialog, check_horizontal=False)
+            QApplication.processEvents()
+            self.assert_cover_candidate_cards_do_not_overlap(dialog)
+
+        self.assert_removed(temp_dir)
+
     def test_cover_gallery_save_switches_current_cover(self):
         with self.make_temp_dir() as temp_dir:
             cfg = self.make_config(temp_dir)