Before this commit, the calendar view showcases tasks by deadline. Because it is a simple date field, the day/week modes don't have much value and are even confusing to the users, who expect to be able to define timeframes. In addition, the quickcreate doesn't allow to select a project. This is problematic because it leads to "ghost" tasks. closes odoo/odoo#52478 Taskid: 2264594 Related: odoo/enterprise#10976 Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>