Committing using web UI does not trigger webhook action "synchronized"

[tobias--]

• Gitea version (or commit ref): be29d5f
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant

Description

The webhook action "synchronized" does not get triggered when changes to the PR-branch are made using the web UI.

Steps to reproduce:

1. Setup webhook to be triggered for every event on a repository
2. Fork this repository
3. Make changes to the fork and commit to a new branch using the web UI
4. Create a Pull Request in the original repository (webhook gets triggered correctly)
5. Make another change to the new branch in the forked repository using the web UI: A webhook event "synchronized" is expected to be triggered but it is not triggered.
6. Checkout the fork/pr-branch, make changes locally and push them back to origin: A webhook event "synchronized" is correctly being triggered

[ethantkoenig]

@tobias-- Could you confirm that #2302 fixes the problem?