Before this commit and since the huge JS refactoring, when you were editing
a blog post it wouldn't save your modifications if you touched the title or
subtitle of the blog.
This was due to title & subtitle getting considered as the cover itself
when saving (_saveElement) because they are inside the cover (in a HTML point
of view).
So if you had modified both the cover, the title and the subtiltle, it was:
1. Saving the cover
2. Saving the cover again
3. Saving the cover again
Now, _saveElement is called as it should, for the same case, it is:
1. Saving the cover
2. Saving the title
3. Saving the subtitle
rde
53ae8becd4