[FIX] mail: fix handling of lastVisibleMessage in channel seen condition

also fix a problem with composer.hasFocus field not always correctly
updated (e.g. when switching from a channel to another in discuss)

task-2278915

closes odoo/odoo#60079

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/addons/mail/static/src/models/composer/composer.js b/addons/mail/static/src/models/composer/composer.js
index 25052fd1b38..0a1d817466e 100644
--- a/addons/mail/static/src/models/composer/composer.js
+++ b/addons/mail/static/src/models/composer/composer.js
@@ -103,6 +103,21 @@ function factory(dependencies) {
         }
 
         /**
+         * Focus this composer and remove focus from all others.
+         * Focus is a global concern, it makes no sense to have multiple composers focused at the
+         * same time.
+         */
+        focus() {
+            const allComposers = this.env.models['mail.composer'].all();
+            for (const otherComposer of allComposers) {
+                if (otherComposer !== this && otherComposer.hasFocus) {
+                    otherComposer.update({ hasFocus: false });
+                }
+            }
+            this.update({ hasFocus: true });
+        }
+
+        /**
          * Inserts text content in text input based on selection.
          *
          * @param {string} content