[IMP] fleet: Add 'Next Activities' on vehicles

This commit adds:
- The button on the chatter
- The button on the kanban card and a progress bar on top of the stage

addons/fleet/models/fleet_vehicle.py

@@ -7,7 +7,7 @@ from odoo import api, fields, models, _
 
 
 class FleetVehicle(models.Model):
-    _inherit = 'mail.thread'
+    _inherit = ['mail.thread', 'mail.activity.mixin']
     _name = 'fleet.vehicle'
     _description = 'Information on a vehicle'
     _order = 'license_plate asc, acquisition_date asc'

addons/fleet/views/fleet_vehicle_views.xml

@@ -112,6 +112,7 @@
                 </sheet>
                 <div class="oe_chatter">
                     <field name="message_follower_ids" widget="mail_followers"/>
+                    <field name="activity_ids" widget="mail_activity"/>
                     <field name="message_ids" widget="mail_thread" options='{"thread_level": 1}'/>
                 </div>
             </form>
@@ -178,6 +179,9 @@
                 <field name="contract_renewal_name" />
                 <field name="contract_renewal_total" />
                 <field name="contract_count" />
+                <field name="activity_ids"/>
+                <field name="activity_state"/>
+                <progressbar field="activity_state" colors='{"planned": "success", "today": "warning", "overdue": "danger"}'/>
 
                 <templates>
                     <t t-name="kanban-box">
@@ -215,6 +219,9 @@
                                     </span>
                                 </a>
                             </div>
+                            <div class="o_kanban_inline_block">
+                                <field name="activity_ids" widget="kanban_activity"/>
+                            </div>
                         </div>
                     </t>
                 </templates>