Change record status: 
Project: 
Introduced in branch: 
8.x
Description: 

Consistent array key syntax in $form_state (underscores vs. spaces). There was only one key that did not use underscores, 'complete form'. This API cleanup added the underscore to all instances of that key in core.

Impacts: 
Module developers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Not done
Details: 

This change will not be implemented in D7.

Progress: 
If this key is used in the Examples for D8, that will need to be changed. The patch to change the $form_state keys in Doxygen (#859970) has been corrected to include the underscore and has been committed to D8. This change is D8 only, and the current Module developer pages don't address anything beyond D7.