Initial cropping support

tests/test_gui_convenience.py

@@ -52,6 +52,22 @@ class GuiConvenienceTests(unittest.TestCase):
             self.app.open_evaluation_button.invoke()
         opened.assert_called_once_with(self.evaluation)
 
+    def test_optional_blank_crop_can_target_a_copy_or_be_skipped(self):
+        copies = self.evaluation/"Copies"
+        copies.mkdir()
+        source = copies/"Copie01.pdf"
+        source.touch()
+        self.app.tree.selection_set("crop_blank_margins")
+        self.app.update()
+        self.assertEqual(self.app.current_step.id, "crop_blank_margins")
+        self.assertEqual(str(self.app.skip_button.cget("state")), "normal")
+        self.app.copy_var.set(source.name)
+        self.app._target_selected_copy()
+        command = self.app._make_command()
+        self.assertEqual(command[-4:], ["crop-margins", str(source), "--workers", "5"])
+        self.app._skip_step()
+        self.assertEqual(self.app.state_store.step("crop_blank_margins")["status"], "skipped")
+
     def test_redo_targets_selected_copy_and_copies_runnable_command(self):
         for folder in ("Copies", "Copies Originales"):
             (self.evaluation / folder).mkdir()