[FIX] website: see versionning changes

Website Versioning module (website_version) is applied when displaying
views by interfering when doing the "render the view of this `key`" and
showing the view with the same `key` but of the currently displayed
version.

The website.page model when directly rendering a page would directly
specify its `id`, thus website version was bypassed and just the master
page was displayed.

With this commit website.page has a "get_view_identifier" that can be
overrided in website_version and has the same previous behavior
otherwise.

This changeset also solves a conflict (`website().get_current_website`
also modify `request.context`) when modifying the context which also
disabled versions.

opw-1824957
closes #23847

addons/website/models/ir_http.py

@@ -70,15 +70,15 @@ class Http(models.AbstractModel):
     @classmethod
     def _add_dispatch_parameters(cls, func):
 
-        context = dict(request.context)
+        context = {}
-        if not context.get('tz'):
+        if not request.context.get('tz'):
             context['tz'] = request.session.get('geoip', {}).get('time_zone')
 
         request.website = request.env['website'].get_current_website()  # can use `request.env` since auth methods are called
         context['website_id'] = request.website.id
 
-        # bind modified context
+        # modify bound context
-        request.context = context
+        request.context = dict(request.context, **context)
 
         super(Http, cls)._add_dispatch_parameters(func)
 
@@ -116,7 +116,7 @@ class Http(models.AbstractModel):
         mypage = pages[0] if pages else False
         _, ext = os.path.splitext(req_page)
         if mypage:
-            return request.render(mypage.view_id.id, {
+            return request.render(mypage.get_view_identifier(), {
                 # 'path': req_page[1:],
                 'deletable': True,
                 'main_object': mypage,

addons/website/models/website.py

@@ -658,6 +658,11 @@ class Page(models.Model):
         item = self.search_read(domain, fields=['id', 'name', 'url', 'website_published', 'website_indexed', 'date_publish', 'menu_ids', 'is_homepage'], limit=1)
         return item
 
+    @api.multi
+    def get_view_identifier(self):
+        """ Get identifier of this page view that may be used to render it """
+        return self.view_id.id
+
     @api.model
     def save_page_info(self, website_id, data):
         website = self.env['website'].browse(website_id)