Backport #27746 by @lng2020
When hitting the `enter` key to create a new project column, the request
is sent twice because the `submit` event and `key up` event are both
triggered.
Probably a better solution is to rewrite these parts of the code to
avoid using native jQuery but reuse the `form-fetch-action` class. But
it's beyond my ability.
Co-authored-by: Nanguan Lin <70063547+lng2020@users.noreply.github.com>
f2bac791db