[FIX] mail: disable initial scroll position for chatter

task-2350534

closes odoo/odoo#59024

X-original-commit: 4db7ecd836525357f408359e000a12880a5eab4a
Related: odoo/enterprise#13782
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/static/src/models/thread_view/thread_viewer.js

@@ -19,6 +19,12 @@ function factory(dependencies) {
             if (!this.threadCache) {
                 return;
             }
+            if (this.chatter) {
+                // Initial scroll position is disabled for chatter because it is
+                // too complex to handle correctly and less important
+                // functionally.
+                return;
+            }
             this.update({
                 threadCacheInitialScrollPositions: Object.assign({}, this.threadCacheInitialScrollPositions, {
                     [this.threadCache.localId]: scrollTop,