This fixes an issue where calendar meetings could generate an excessive number of chatter messages. Users should see cleaner meeting histories with fewer unnecessary notifications, making important updates easier to follow.

Calendar meetings no longer generate excessive chatter notifications during normal use. This helps users focus on relevant updates and reduces unnecessary message clutter around meeting changes.

Task: https://www.odoo.com/web#id=9862&view_type=form&model=project.task&menu_id=3942&action=327
Pad: https://pad.odoo.com/p/openerp-project.task-K961IHH89D
Fixing flod of chatter messages while dealing with Calendar Meetings.