32k pixel as hard group limit, better manual resolution support

tests/test_gui_core.py

@@ -19,6 +19,7 @@ from PIL import Image
 from pypdf import PdfReader, PdfWriter
 
 from copienator import (
+    CliError,
     EvaluationWorkspace,
     WorkspaceNotFoundError,
     WorkspaceValidationError,
@@ -2058,7 +2059,23 @@ class StandardCliTests(unittest.TestCase):
             self.assertEqual(groups, [["Ex 1"], ["Ex 2"]])
             editor.assert_not_called()
 
-    def test_grouped_batching_does_not_split_one_student(self) -> None:
+    def test_grouped_batching_looks_ahead_to_keep_below_the_hard_limit(self) -> None:
+        module = self.modules["annotating_by_label"]
+        large = Image.new("RGB", (10, 80), "white")
+        small = Image.new("RGB", (10, 15), "white")
+        rendered = [
+            ("01", "Ex 1", large, 0, []),
+            ("02", "Ex 1", small, 0, []),
+            ("02", "Ex 2", small, 0, []),
+        ]
+        with patch.object(module, "MAX_HEIGHT_PX", 100):
+            batches = module.split_batches(rendered)
+        self.assertEqual([len(batch) for batch in batches], [1, 2])
+        self.assertTrue(
+            all(sum(item[2].height for item in batch) <= 100 for batch in batches)
+        )
+
+    def test_grouped_batching_never_splits_one_student(self) -> None:
         module = self.modules["annotating_by_label"]
         image = Image.new("RGB", (10, 60), "white")
         rendered = [
@@ -2066,9 +2083,16 @@ class StandardCliTests(unittest.TestCase):
             ("01", "Ex 2", image, 0, []),
             ("02", "Ex 1", image, 0, []),
         ]
-        with patch.object(module, "MAX_HEIGHT_PX", 100):
-            batches = module.split_batches(rendered)
-        self.assertEqual([len(batch) for batch in batches], [2, 1])
+        with patch.object(module, "MAX_HEIGHT_PX", 100), self.assertRaises(
+            CliError
+        ) as raised:
+            module.split_batches(rendered)
+        self.assertIn("Copie01", str(raised.exception))
+        self.assertIn("cannot be split", str(raised.exception))
+
+    def test_grouped_annotation_height_limit_is_32000_pixels(self) -> None:
+        module = self.modules["annotating_by_label"]
+        self.assertEqual(module.MAX_HEIGHT_PX, 32000)
 
 
 class WorkflowTests(unittest.TestCase):