[FIX] mail: do not compute chat windows in DiscussPublicView

__Current behavior before PR:__
When someone joins a call in the discuss public view and receives a message in the chatter, the part of the screen supposed to display the video streams of the participants goes black.

This happens because it is trying to open a chat window in the bottom right as it is done usually. However since we are in the public view it removes it instantly together with the participants cards.

__Description of the fix:__
If we are in the discuss public view, it is useless to make chat windows. This will prevent opening of chat windows.

__Steps to reproduce the issue:__
1. Open the discuss app and start a meeting.
2. Copy the Invitation Link
3. Open a new private window to join the call with a guest user.
4. Then go back to the non-guest user page and send a message in the chatter.
5. Notice that the participants cards vanished on the private window page.

opw-3229747

closes odoo/odoo#121195

X-original-commit: 49d56c5449e1bd9457fb935e98134cafc75931dc
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>
Signed-off-by: Louis Wicket (wil) <wil@odoo.com>

addons/mail/static/src/models/chat_window_manager.js

@@ -252,7 +252,10 @@ registerModel({
                 if (!this.messaging || !this.messaging.device) {
                     return visual;
                 }
-                if (!this.messaging.device.isSmall && this.messaging.discuss.discussView) {
+                if (
+                    (!this.messaging.device.isSmall && this.messaging.discuss.discussView) ||
+                    this.messaging.discussPublicView
+                ) {
                     return visual;
                 }
                 if (!this.chatWindows.length) {

addons/mail/static/src/models/discuss_public_view.js

@@ -60,6 +60,12 @@ registerModel({
         isChannelTokenSecret: attr({
             default: true,
         }),
+        messagingAsPublicView: one('Messaging', {
+            compute() {
+                return this.messaging;
+            },
+            inverse: 'discussPublicView',
+        }),
         shouldAddGuestAsMemberOnJoin: attr({
             default: false,
             readonly: true,

addons/mail/static/src/models/messaging.js

@@ -321,6 +321,10 @@ registerPatch({
             isCausal: true,
             readonly: true,
         }),
+        discussPublicView: one('DiscussPublicView', {
+            inverse: 'messagingAsPublicView',
+            isCausal: true,
+        }),
         emojiRegistry: one('EmojiRegistry', {
             default: {},
             isCausal: true,