Purpose of this commit is to ensure side documents are redirected to the
master opportunity when merging leads. Those side documents include
* communication history (mail.message);
* attachments (ir.attachment);
* visitors (website.visitor);
However some documents are currently not specifically handled :
* meetings (calendar.event);
* activities (mail.activity);
* sale orders (sale.order);
* attendees (event.registration);
In this commit we ensure all are attached to the final master opportunity.
That way we prevent loosing access to those documents and ensure we keep
the complete history of all merged leads.
Also tests are added to ensure the merging of leads and its contents.
A new field is added to have the o2m field between leads and calendar events.
In order to clarify naming, ``meeting_count`` is renamed to
``calendar_event_count`` to match naming.
Task Id-2457941
COM PR odoo/odoo#68884
UPG PR odoo/odoo#2494
Related: odoo/upgrade#2494
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
Anjali
a99d882c02