[FIX] mail: channel unpin/delete issues

Before this commit:

Channel was not getting unpinned after being deleted

After this commit:

- Channel gets unpinned for all the channel members after being deleted
- If a user leaves channel/group then all of the messages of that channel/group
  are removed from the user's history/starred/inbox channel.

Task-2814440

closes odoo/odoo#139972

X-original-commit: 4767d6001d15628768388bcac98c04ab185040c8
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/models/discuss/discuss_channel.py

@@ -240,6 +240,7 @@ class Channel(models.Model):
             all_emp_group = None
         if all_emp_group and all_emp_group in self:
             raise UserError(_('You cannot delete those groups, as the Whole Company group is required by other modules.'))
+        self.env['bus.bus']._sendmany([(channel, 'discuss.channel/delete', {'id': channel.id}) for channel in self])
 
     def write(self, vals):
         if 'channel_type' in vals:

addons/mail/static/src/core/web/thread_service_patch.js

@@ -141,11 +141,14 @@ patch(ThreadService.prototype, {
         }
         thread.suggestedRecipients = recipients;
     },
-    async leaveChannel(channel) {
+    closeChatWindow(channel) {
         const chatWindow = this.store.discuss.chatWindows.find((c) => c.thread?.eq(channel));
         if (chatWindow) {
-            await this.chatWindowService.close(chatWindow);
+            this.chatWindowService.close(chatWindow, { notifyState: false });
         }
+    },
+    async leaveChannel(channel) {
+        this.closeChatWindow(channel);
         super.leaveChannel(...arguments);
     },
     /** @param {import("models").Thread} thread */

addons/mail/static/src/discuss/core/common/discuss_core_common_service.js

@@ -63,6 +63,36 @@ export class DiscussCoreCommon {
                 });
                 thread.delete();
             });
+            this.busService.subscribe("discuss.channel/delete", (payload) => {
+                const thread = this.store.Thread.insert({
+                    id: payload.id,
+                    model: "discuss.channel",
+                });
+                const filteredStarredMessages = [];
+                let starredCounter = 0;
+                for (const msg of this.store.discuss.starred.messages) {
+                    if (!msg.originThread?.eq(thread)) {
+                        filteredStarredMessages.push(msg);
+                    } else {
+                        starredCounter++;
+                    }
+                }
+                this.store.discuss.starred.messages = filteredStarredMessages;
+                this.store.discuss.starred.counter -= starredCounter;
+                this.store.discuss.inbox.messages = this.store.discuss.inbox.messages.filter(
+                    (msg) => !msg.originThread?.eq(thread)
+                );
+                this.store.discuss.inbox.counter -= thread.message_needaction_counter;
+                this.store.discuss.history.messages = this.store.discuss.history.messages.filter(
+                    (msg) => !msg.originThread?.eq(thread)
+                );
+                this.threadService.closeChatWindow?.(thread);
+                if (thread.eq(this.store.discuss.thread)) {
+                    this.threadService.setDiscussThread(this.store.discuss.inbox);
+                }
+                thread.messages.splice(0, thread.messages.length);
+                thread.delete();
+            });
             this.busService.addEventListener("notification", ({ detail: notifications }) => {
                 // Do not handle new message notification if the channel was just left. This issue
                 // occurs because the "discuss.channel/leave" and the "discuss.channel/new_message"