[FIX] change way for show "Send message" button

mail_base/static/src/js/base.js

@@ -63,6 +63,10 @@ var channel_seen = _.throttle(function (channel) {
 
 var ChatAction = core.action_registry.get('mail.chat.instant_messaging');
 ChatAction.include({
+    init: function(parent, action, options) {
+        this._super.apply(this, arguments);
+        this.show_send_message_button = ['channel_inbox'];
+    },
     start: function() {
         var result = this._super.apply(this, arguments);
 

mail_sent/static/src/js/sent.js

@@ -20,12 +20,13 @@ var ChatAction = core.action_registry.get('mail.chat.instant_messaging');
 ChatAction.include({
     set_channel: function(channel){
         var result = this._super.apply(this, arguments);
+        // Add "Send message" button in the Sent menu
+        this.show_send_message_button.push('channel_sent');
         var self = this;
         return $.when(result).done(function() {
-            // Add "Send message" button in the Sent menu
             self.$buttons
                 .find('.o_mail_chat_button_new_message')
-                .toggle(channel.id === "channel_inbox" || channel.id === "channel_sent");
+                .toggle(self.show_send_message_button.includes(channel.id));
         });
     },
     get_thread_rendering_options: function (messages) {