fix(groups): trim whitespace in "Add user to group" email (Closes #1387) #1427
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Issue: Closes #1387
Problem
Adding a user to a group failed when the email had leading/trailing spaces.
Fix
Add a WTForms filter to strip whitespace before validation in the staff add-member form.
(Optional) Defensive strip in the controller if applied.
Test
tests/test_staff_group_add_trim.py:
Env
pyenv Python 3.7.17; tests via
python -m pytest.