cubicweb #2407770 __linkto url param is not used as a field value in creation forms [validation pending]

As a consequence (there are some others, like not being able to use a HiddenInput to link a new entity to another), designated __linkto targets are not selected in a vocabulary-driven field (like a html selector).

To reproduce this, create a BlogEntry from the primary view's Blog action "add entry": the blog must be explicitely selected or the entry will not be linked to it by the entry_of relation.

prioritynormal
typebug
done in3.15.2
load0.300
load left0.000
closed by#1c5f3c66ec53 [html form] use __linkto url parameter value as a default value of the corresponding field in a creation form (closes #2407770)