Control for selecting multiple columns [pgadmin4]

Hi,

PFA backform control for selecting multiple columns.(This control depends
on column node.)

Usage:

{
id: 'columns', label: '{{ _('Columns') }}',
type: 'collection', group: '{{ _('Definition') }}', editable:true,
canDelete: true, canAdd: true, control: Backform.MultiColumnSelectControl,
deps: ['index'], node: 'column',
model: pgBrowser.Node.Model.extend({
keys: ['column'],
defaults: {
column: undefined
}
})
}

Note: When using this control model should have *column* attribute. And
node property should be *column*.

--
*Harshal Dhumal*
*Software Engineer *

EenterpriseDB <http://www.enterprisedb.com>