When focusing a checkbox field and hitting the "enter" key, the
checkbox should change its status. Before this commit, this produced
a traceback instead as it was trying to call the `_onKeyDown`
function while it was defined as `_onKeydown`.
Also the `_onKeydown` method is in fact declared in the `AbstractField`
parent implementation, so there is no point in declaring the event
binding twice. Also, part of the `FieldBoolean._onKeydown` code was in
common with its parent `AbstractField._onKeydown` code so remove it as
there is no point in duplicating it.
Note: this `_onKeydown` method has to be refactored as it is breaking
form view navigation anyway.
Also modify an existing test to check the checkbox keyboard navigation.
qsm-odoo
c60743428d