[Add] mail_track_diff_only

mail_track_diff_only/__init__.py

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+from . import models

mail_track_diff_only/__manifest__.py

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+{
+    "name": "Mail track diff only",
+    "version": "12.0.1.0.0",
+    "author": "Vauxoo, Odoo Community Association (OCA)",
+    "category": "Discuss",
+    "website": "http://www.vauxoo.com/",
+    "license": "AGPL-3",
+    "depends": [
+        "mail",
+    ],
+    "demo": [],
+    "data": [],
+    "installable": True,
+}

mail_track_diff_only/models/__init__.py

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+from . import mail_thread

mail_track_diff_only/models/mail_thread.py

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+from odoo import models, api
+
+
+class MailThread(models.AbstractModel):
+    _inherit = 'mail.thread'
+
+    @api.multi
+    def _message_track(self, tracked_fields, initial):
+        """For a given record, fields to check (column name, column info)
+        and initial values, return a structure that is a tuple containing :
+
+        - a set of updated column names
+        - a list of changes (old value, new value, column name, column info)
+        """
+        changes = super(MailThread, self)._message_track(
+            tracked_fields, initial)[0]
+        tracking_value_ids = []
+        track_obj = self.env['mail.tracking.value']
+
+        for col_name, col_info in tracked_fields.items():
+            initial_value = initial[col_name]
+            new_value = getattr(self, col_name)
+
+            if new_value != initial_value and (new_value or initial_value):
+                track_sequence = getattr(
+                    self._fields[col_name], 'track_sequence', 100)
+                tracking = track_obj.create_tracking_values(
+                    initial_value, new_value, col_name,
+                    col_info, track_sequence)
+                if tracking:
+                    tracking_value_ids.append([0, 0, tracking])
+
+        return changes, tracking_value_ids

mail_track_diff_only/readme/CONTRIBUTORS.rst

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+* José Manuel Robles <josemanuel@vauxoo.com>
+* Hugo Adan <hugo@vauxoo.com>

mail_track_diff_only/readme/DESCRIPTION.rst

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+This module shows only the values changed of an object on email, instead of all
+tracked values, even if it has track_visibility set as always.