Editing fields inline also shows fieldsets added via hook_field_attach_form()

Thanks for reporting! This is actually a bug in FAPE then, because we're just using FAPE for this part of the functionality.

@merlinofchaos: this is not by design, is it?

This is not actually a bug in FAPE, it's a deficiency of Drupal 7 core.

From #1935676-6: Redirect module compatibility: its form items are visible while doing in-place editing (i.e. when looking at per-field form):

The Redirect module uses hook_field_attach_form() to insert its form item. It does this because there's no way to alter all different entity types' forms in Drupal 7 (also not yet in Drupal 8, FWIW). It's technically wrong, but they also don't have a choice. So, I'm adding a similar work-around as the one that was added for the Metatag module.

In Drupal 8, this will hopefully be solved by Entity API in core.

This is how I handle it in the FATE module, what do you think?

Committed.