[FIX] base,website_google_map: fix partner address not showing

Following commit 983c7e8152.

`_compute_display_name` is overridden in partner to force `show_adress` and some
other context variables to None. When those values are in the context, calling
`display_name` can give a different result than calling `name_get()[0][1]`.

This commit reverts the changes of the mentioned commit where the behavior is
actually different, that is, when `show_address` is in the context.

It also adds a comment on the `_compute_display_name` method to avoid further
mistakes.

closes odoo/odoo#29510

addons/website_google_map/controllers/main.py

@@ -43,7 +43,7 @@ class GoogleMap(http.Controller):
             partner_data["partners"].append({
                 'id': partner.id,
                 'name': escape(partner.name),
-                'address': escape('\n'.join(partner.display_name.split('\n')[1:])),
+                'address': escape('\n'.join(partner.name_get()[0][1].split('\n')[1:])),
                 'latitude': escape(str(partner.partner_latitude)),
                 'longitude': escape(str(partner.partner_longitude)),
             })

odoo/addons/base/models/ir_qweb_fields.py

@@ -643,7 +643,7 @@ class Contact(models.AbstractModel):
         opf = options and options.get('fields') or ["name", "address", "phone", "mobile", "email"]
         opsep = options and options.get('separator') or "\n"
         value = value.sudo().with_context(show_address=True)
-        name_get = value.display_name
+        name_get = value.name_get()[0][1]
 
         val = {
             'name': name_get.split("\n")[0],

odoo/models.py

@@ -1560,6 +1560,17 @@ class BaseModel(MetaModel('DummyModel', (object,), {'_register': False})):
 
     @api.depends(lambda self: (self._rec_name,) if self._rec_name else ())
     def _compute_display_name(self):
+        """Compute the value of the `display_name` field.
+
+        In general `display_name` is equal to calling `name_get()[0][1]`.
+
+        In that case, it is recommended to use `display_name` to uniformize the
+        code and to potentially take advantage of prefetch when applicable.
+
+        However some models might override this method. For them, the behavior
+        might differ, and it is important to select which of `display_name` or
+        `name_get()[0][1]` to call depending on the desired result.
+        """
         names = dict(self.name_get())
         for record in self:
             record.display_name = names.get(record.id, False)