[IMP] base,mail: allow to customize the activity view

The activity view has been greatly improved to allow to customize it
more easily. It works quite similarly to the kanban view, defining
`<field>` tags at the top and using these fields in the `<template>`
section. The template name used to define the activity cards is
`activity-box`.

Note that these activity cards are rendered using `KanbanRecord` widget
(this has implied that ActivityView inherits from `BasicView`).

Also note that the view validation has been moved in base to include the
common grammar.

Task 1894990

1 files changed, 0 insertions, 9 deletions

diff --git a/odoo/models.py b/odoo/models.py
index 8ebd58f4b1d..365e4d1a332 100644
--- a/odoo/models.py
+++ b/odoo/models.py
@@ -1269,15 +1269,6 @@ class BaseModel(MetaModel('DummyModel', (object,), {'_register': False})):
         return E.tree(element, string=self._description)
 
     @api.model
-    def _get_default_activity_view(self):
-        """ Generates an empty activity view.
-
-        :returns: a activity view as an lxml document
-        :rtype: etree._Element
-        """
-        return E.activity(string=self._description)
-
-    @api.model
     def _get_default_pivot_view(self):
         """ Generates an empty pivot view.