Clicking multiple times on 'Create' (in main list views) or 'Add an
item' (in o2m lists) might create invalid rows (i.e. rows with
required fields unset).
Creating a new record requires two sequential RPCs: a default_get
and an onchange (only if there is an onchange of one of the
record's field). When clicking twice to create a new record, that
sequence of RPCs is done twice in parallel, after unselecting the
current row (i.e. saving it if it is valid). However, in both
cases, there is no line to unselect yet (as both operations are
done basically simultaneously). When the first onchange returns,
a first new record is added to the list. When the second returns,
the second one is added and takes the edition, leaving the first
one, invalid, in the list.
This rev. ensures this doesn't happen by preventing concurrent
record creation.
Aaron Bohy
f9a1241721