Mobile section editing no longer works (it always edits whole article).
Steps to reproduce:
- Visit a page like https://en.m.wikipedia.beta.wmflabs.org/wiki/Lion#Taxonomy_and_evolution
- Tap the edit pencil next to a section heading
Expected: the editor opens (either VE or WTE), only text of that section is visible
Actual: the editor opens, text of the entire article is visible