Intention:
When you open VisualEditor for the first time, you get a message that says you can switch to wikitext, but that unsaved changes will be lost:
"You can keep using the wikitext editor by clicking the "Edit source" tab instead – unsaved changes will be lost."
This is not always true, since (currently for non-Firefox users) it is possible to switch to wikitext using the new menu item without losing any changes.
Reproducible: Always
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=57462
https://bugzilla.wikimedia.org/show_bug.cgi?id=57700