[FIX] website: fix multi website redirections

Before this commit, switching websites with custom domains was not
properly done: the client action should redirect to the custom domain if
there is one, instead of only redirecting the iframe.

The redirection was not correct for the "go to website" buttons either:
in that case, the url was incorrectly generated for the redirection (the
custom domain was passed in the path parameter of the client action).

See merge commit for more information.

task-2687506

addons/website/models/mixins.py

@@ -283,11 +283,12 @@ class WebsitePublishedMultiMixin(WebsitePublishedMixin):
             return is_published
 
     def open_website_url(self):
-        url = url_join(self.website_id.domain, self.website_url) if self.website_id.domain else self.website_url
-        url = self.env['website'].get_client_action_url(url)
+        client_action_url = self.env['website'].get_client_action_url(self.website_url)
+        if self.website_id.domain:
+            client_action_url = url_join(self.website_id.domain, f'{client_action_url}&website_id={self.website_id.id}')
         return {
             'type': 'ir.actions.act_url',
-            'url': url,
+            'url': client_action_url,
             'target': 'self',
         }
 

addons/website/static/src/client_actions/website_preview/website_preview.js

@@ -62,7 +62,11 @@ export class WebsitePreview extends Component {
             this.isWebsitePublisher = await this.user.hasGroup('website.group_website_publisher');
             await this.websiteService.fetchWebsites();
             const encodedPath = encodeURIComponent(this.path);
-            this.initialUrl = `/website/force/${this.websiteId}?path=${encodedPath}`;
+            if (this.websiteDomain && this.websiteDomain !== window.location.origin) {
+                window.location.href = `${this.websiteDomain}/web#action=website.website_preview&path=${encodedPath}&website_id=${this.websiteId}`;
+            } else {
+                this.initialUrl = `/website/force/${this.websiteId}?path=${encodedPath}`;
+            }
         });
 
         useEffect(() => {
@@ -114,6 +118,10 @@ export class WebsitePreview extends Component {
         return websiteId;
     }
 
+    get websiteDomain() {
+        return this.websiteService.websites.find(website => website.id === this.websiteId).domain;
+    }
+
     get path() {
         let path = this.websiteService.editedObjectPath;
         if (!path) {

addons/website/static/src/systray_items/website_switcher.js

@@ -17,7 +17,13 @@ export class WebsiteSwitcherSystray extends Component {
             name: website.name,
             id: website.id,
             callback: () => {
-                this.websiteService.goToWebsite({ websiteId: website.id });
+                if (website.domain && website.domain !== window.location.origin) {
+                    const { location: { pathname, search, hash } } = this.websiteService.contentWindow;
+                    const path = pathname + search + hash;
+                    window.location.href = `${website.domain}/web#action=website.website_preview&path=${encodeURI(path)}&website_id=${website.id}`;
+                } else {
+                    this.websiteService.goToWebsite({ websiteId: website.id });
+                }
             },
         }));
     }