Micon Menu breaks link_attributes (form elements missing in menu item form)

Problem/Motivation

Using micon_menu and link_attributes module is incompatible. link_attributes exposes attributes on the menu item create / edit form, which are no more existing if micon_menu is enabled.

With micon_menu disabled they are visible again.

Steps to reproduce

Install link_attributes module and see menu item link attributes when creating / editing a menu item
Enable micon_menu and see the form items from link_attributes are missing

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes