misc: add support for manual ordering to workflow categories (#56533)

tests/admin_pages/test_workflow.py

@@ -208,6 +208,23 @@ def test_workflows_category(pub):
     workflow.refresh_from_storage()
     assert str(workflow.category_id) == '1'
 
+    resp = app.get('/backoffice/workflows/categories/')
+    resp = resp.click('New Category')
+    resp.forms[0]['name'] = 'a second category'
+    resp.forms[0]['description'] = 'description of the category'
+    resp = resp.forms[0].submit('submit')
+    assert WorkflowCategory.get(2).name == 'a second category'
+
+    app.get('/backoffice/workflows/categories/update_order?order=2;1;')
+    categories = WorkflowCategory.select()
+    WorkflowCategory.sort_by_position(categories)
+    assert [x.id for x in categories] == ['2', '1']
+
+    app.get('/backoffice/workflows/categories/update_order?order=1;2;')
+    categories = WorkflowCategory.select()
+    WorkflowCategory.sort_by_position(categories)
+    assert [x.id for x in categories] == ['1', '2']
+
     resp = app.get('/backoffice/workflows/categories/')
     resp = resp.click('a new category')
     resp = resp.click('Delete')

wcs/admin/workflows.py

@@ -1889,7 +1889,8 @@ class WorkflowsDirectory(Directory):
             else:
                 unused_workflows.append(workflow)
 
-        categories = sorted(WorkflowCategory.select(), key=lambda x: misc.simplify(x.name))
+        categories = self.category_class.select()
+        self.category_class.sort_by_position(categories)
 
         if categories:
             default_category = WorkflowCategory('Default')

wcs/categories.py

@@ -167,6 +167,7 @@ class WorkflowCategory(Category):
         ('name', 'str'),
         ('url_name', 'str'),
         ('description', 'str'),
+        ('position', 'int'),
     ]
 
     @classmethod