Issue #2940201 by xjm, amateescu, benjifisher, tedbow, tim.plunkett, Berdir:...

Issue #2940201 by xjm, amateescu, benjifisher, tedbow, tim.plunkett, Berdir: hook_field_widget_form_alter() can no longer affect the whole widget for multi-value fields

(cherry picked from commit c924020c)