Binds a Phoenix.HTML.FormField to the <.web_multiselect> component's
:id, :name, and :value assigns.
Summary
Functions
Resolves the field assign into concrete id, name, and value assigns.
Functions
Resolves the field assign into concrete id, name, and value assigns.
When assigns.field is a Phoenix.HTML.FormField, its id, name, and value
fill in any unset assign. Explicit assigns win — passing both field and id
keeps the explicit id.