Load the summary asynchronously for quick startup.

- Interface starts before loading begins.
- Split out summary info into separate storage.
- Fixed iteration of PagedList.
- Not saving partially loaded summary during load.

tests/__main___test.py

@@ -159,7 +159,7 @@ class SummarySyncWithFilesystemTestCase(unittest.TestCase):
         self.assertEqual(self.summary.completed_total, completed_total)
         self.assertEqual(self.summary.result_total, result_total)
         max_width = max((len(row) for row in self.summary._entries), default=0)
-        self.assertEqual(self.summary._max_width, max_width)
+        self.assertEqual(__main__.Entry.MAX_WIDTH, max_width)
         max_path_length = max(
             (len(row.path) - 2 for row in self.summary._entries), default=0)
         self.assertEqual(self.summary._max_path_length, max_path_length)

tests/paged_list_test.py

@@ -31,6 +31,12 @@ class PagedListTestCase(unittest.TestCase):
             self.assertEqual(list_[1:5], [4, 5, 6, 7])
             self.assertEqual(list_[:2], [3, 4])
             self.assertEqual(list_[2:], [5, 6, 7, 8])
+            self.assertEqual(list(list_), [3, 4, 5, 6, 7, 8])
+            self.assertRaises(IndexError, list_.__getitem__, 6)
+        with tempfile.TemporaryDirectory() as temp_dir:
+            list_ = paged_list.PagedList([], temp_dir, 2, 2)
+            self.assertRaises(IndexError, list_.__getitem__, 0)
+            # self.assertEqual(list_[3:4], [])   FIX
 
     def test_pickling(self):
         with tempfile.TemporaryDirectory() as temp_dir: