=== Behavior
1. Visit https://en.wikipedia.beta.wmflabs.org/
2. Go to https://en.wikipedia.beta.wmflabs.org/wiki/Special:Preferences#mw-prefsection-editing
3. "Check" the box next to the `Enable experimental tools in the quick replying and quick topic adding features' source modes` setting
4. Click `Save`
5. Visit a talk page (e.g. https://en.wikipedia.beta.wmflabs.org/wiki/User_talk:Ppelberg-test)
6. Open the Reply Tool
7. Switch to the `Visual` mode if you are not there already
8. Type a comment (the comment I draft included a ping)
9. Click the `Source` affordance
**Actual**
10. ❗️Clicking the `Source` affordance does nothing (read: you remain in the tool's `Visual` mode)
**Expected**
10. ✅Clicking the `Source` affordance takes you to the tool's `Visual` mode)
//See screen recording: //
=== Done
- [ ] Expected behavior is implemented