[MIG] project_only_current_project_tasks_as_parent: migrate to 18.0

migrates add-on project_parent_task to 18.0 and change the add-on name
for more understanding.

project_only_current_project_tasks_as_parent/README.rst

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+============================================
+project_only_current_project_tasks_as_parent
+============================================
+
+when selecting a parent task in a task, display only tasks from the current project
+
+Installation
+============
+
+Use Odoo normal module installation procedure to install ``project_only_current_project_tasks_as_parent``.
+
+Known issues / Roadmap
+======================
+
+None yet.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `our issues website <https://github.com/elabore-coop/project-tools/issues>`_. In case of
+trouble, please check there if your issue has already been
+reported. If you spotted it first, help us smashing it by providing a
+detailed and welcomed feedback.
+
+Credits
+=======
+
+Contributors
+------------
+
+* Laetitia Da Costa (https://github.com/LaetitiaElabore)
+* Stéphan Sainléger (https://github.com/stephansainleger)
+
+Funders
+-------
+
+The development of this module has been financially supported by:
+* Elabore (https://elabore.coop)
+
+
+Maintainer
+----------
+
+This module is maintained by Elabore.

project_only_current_project_tasks_as_parent/__manifest__.py

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+# Copyright 2022 Laetitia Da Costa (Elabore)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+{
+    "name": "project_only_current_project_tasks_as_parent",
+    "version": "18.0.1.0.0",
+    "author": "Elabore",
+    "website": "https://elabore.coop",
+    "maintainer": "Laetitia Da Costa",
+    "license": "AGPL-3",
+    "category": "Project",
+    "summary": "In parent's tasks dropdown field, show only tasks from the current projet",
+    # any module necessary for this one to work correctly
+    "depends": [
+        "base",
+        "project",
+    ],
+    "qweb": [
+        # "static/src/xml/*.xml",
+    ],
+    "external_dependencies": {
+        "python": [],
+    },
+    # always loaded
+    "data": [
+        "views/project_task.xml",
+    ],
+    # only loaded in demonstration mode
+    "demo": [],
+    "js": [],
+    "css": [],
+    "installable": True,
+    # Install this module automatically if all dependency have been previously
+    # and independently installed.  Used for synergetic or glue modules.
+    "auto_install": False,
+    "application": False,
+}

project_only_current_project_tasks_as_parent/views/project_task.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <record model="ir.ui.view" id="view_tasks_form2_parent_project_inherited">
+        <field name="name">view.tasks.form2.parent.project.inherited</field>
+        <field name="model">project.task</field>
+        <field name="inherit_id" ref="project.view_task_form2" />
+        <field name="arch" type="xml">
+            <xpath expr="//page[@name='extra_info']//field[@name='parent_id']" position="attributes">
+                <attribute name="domain">[('project_id','=', project_id), ('stage_id.fold', '=', False)]</attribute>
+            </xpath>
+        </field>
+    </record>
+</odoo>