[IMP] project: improve calendar view

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>

addons/project/static/src/js/project_calendar.js

@@ -0,0 +1,22 @@
+odoo.define('project.ProjectCalendarView', function (require) {
+"use strict";
+
+const CalendarController = require('web.CalendarController');
+const CalendarView = require('web.CalendarView');
+const viewRegistry = require('web.view_registry');
+
+const ProjectCalendarController = CalendarController.extend({
+    _renderButtonsParameters() {
+        return _.extend({}, this._super(...arguments),  {scaleDrop: true});
+    },
+});
+
+const ProjectCalendarView = CalendarView.extend({
+        config: _.extend({}, CalendarView.prototype.config, {
+            Controller: ProjectCalendarController,
+        }),
+    });
+
+viewRegistry.add('project_calendar', ProjectCalendarView);
+return ProjectCalendarView;
+});

addons/project/views/project_assets.xml

@@ -7,6 +7,7 @@
                 <script type="text/javascript" src="/project/static/src/js/project_rating_reporting.js"></script>
                 <script type="text/javascript" src="/project/static/src/js/project_task_kanban_examples.js"></script>
                 <script type="text/javascript" src="/project/static/src/js/tours/project.js"></script>
+                <script type="text/javascript" src="/project/static/src/js/project_calendar.js"></script>
                 <link rel="stylesheet" type="text/scss" href="/project/static/src/scss/project_dashboard.scss"/>
             </xpath>
         </template>

addons/project/views/project_views.xml

@@ -873,7 +873,8 @@
             <field name="model">project.task</field>
             <field eval="2" name="priority"/>
             <field name="arch" type="xml">
-                <calendar date_start="date_deadline" string="Tasks" mode="month" color="user_id" event_limit="5" hide_time="true">
+                <calendar date_start="date_deadline" string="Tasks" mode="month" color="user_id" event_limit="5"
+                          hide_time="true" quick_add="False" js_class="project_calendar">
                     <field name="user_id" avatar_field="image_128" filters="1"/>
                     <field name="date_deadline"/>
                     <field name="project_id"/>

addons/web/static/src/xml/web_calendar.xml

@@ -91,8 +91,14 @@
 
     <t t-name="CalendarView.buttons">
         <div class="o_calendar_buttons">
-            <t t-call="CalendarView.navigation_buttons" />
-            <t t-call="CalendarView.scale_buttons" />
+            <span class="o_calendar_navigation_buttons">
+                <t t-call="CalendarView.navigation_buttons" />
+            </span>
+            <t t-if="!scaleDrop">
+                <span class="o_calendar_scale_buttons">
+                    <t t-call="CalendarView.scale_buttons" />
+                </span>
+            </t>
         </div>
     </t>