[IMP] project: improve tags management

In big databases, the number of tags becomes rapidly huge. This makes
it very hard to find revelant tags. In practice, the same few tags are
usually used in a given project.

This commit:
- Limits the search of tags to the project's tags of the task as well
  as to the tasks' tags of the task's project.
- Prevents creating case sensitive variants of existing tags.
- Reuse existing tags from other projects and other projects' tasks
  when the user `creates` (or at least thinks creating as the
  _name_search would not return the searched tag) a new tag in his project.

task-2735833

closes odoo/odoo#82925

Related: odoo/enterprise#23814
Signed-off-by: Laurent Stukkens (ltu) <ltu@odoo.com>

addons/project/models/project.py

@@ -11,7 +11,7 @@ from random import randint
 from odoo import api, Command, fields, models, tools, SUPERUSER_ID, _
 from odoo.exceptions import UserError, ValidationError, AccessError
 from odoo.tools import format_amount
-from odoo.osv.expression import OR
+from odoo.osv.expression import OR, AND
 from odoo.tools.misc import get_lang
 
 from .project_task_recurrence import DAYS, WEEKS
@@ -2233,7 +2233,27 @@ class ProjectTags(models.Model):
 
     name = fields.Char('Name', required=True, translate=True)
     color = fields.Integer(string='Color', default=_get_default_color)
+    project_ids = fields.Many2many('project.project', 'project_project_project_tags_rel', string='Projects')
+    task_ids = fields.Many2many('project.task', string='Tasks')
 
     _sql_constraints = [
         ('name_uniq', 'unique (name)', "Tag name already exists!"),
     ]
+
+    @api.model
+    def _name_search(self, name='', args=None, operator='ilike', limit=100, name_get_uid=None):
+        domain = args
+        if 'project_id' in self.env.context:
+            project_id = self.env.context.get('project_id')
+            domain = AND([
+                domain,
+                ['|', ('task_ids.project_id', '=', project_id), ('project_ids', 'in', project_id)]
+            ])
+        return super()._name_search(name, domain, operator, limit, name_get_uid)
+
+    @api.model
+    def name_create(self, name):
+        existing_tag = self.search([('name', '=ilike', name.strip())], limit=1)
+        if existing_tag:
+            return existing_tag.name_get()[0]
+        return super().name_create(name)

addons/project/views/project_views.xml

@@ -923,7 +923,7 @@
                             <field name="partner_id" widget="res_partner_many2one" class="o_task_customer_field"/>
                             <field name="partner_phone" widget="phone" attrs="{'invisible': True}"/>
                             <field name="date_deadline" attrs="{'invisible': [('is_closed', '=', True)]}"/>
-                            <field name="tag_ids" widget="many2many_tags" options="{'color_field': 'color', 'no_create_edit': True}"/>
+                            <field name="tag_ids" widget="many2many_tags" options="{'color_field': 'color', 'no_create_edit': True}" context="{'project_id': project_id}"/>
                             <field name="recurring_task" attrs="{'invisible': [('allow_recurring_tasks', '=', False)]}" />
                             <field name="legend_blocked" invisible="1"/>
                             <field name="legend_normal" invisible="1"/>
@@ -1210,7 +1210,7 @@
                     <field name="company_id" groups="base.group_multi_company" optional="show"/>
                     <field name="activity_ids" widget="list_activity" optional="show"/>
                     <field name="date_deadline" optional="hide" widget="remaining_days" attrs="{'invisible': [('is_closed', '=', True)]}"/>
-                    <field name="tag_ids" widget="many2many_tags" options="{'color_field': 'color'}" optional="show"/>
+                    <field name="tag_ids" widget="many2many_tags" options="{'color_field': 'color'}" optional="show" context="{'project_id': project_id}"/>
                     <field name="rating_last_text" string="Rating" decoration-danger="rating_last_text == 'ko'"
                         decoration-warning="rating_last_text == 'ok'" decoration-success="rating_last_text == 'top'"
                         attrs="{'invisible': [('rating_last_text', '=', 'none')]}"