Add CallbackQuery::regular_message getter

crates/teloxide-core/CHANGELOG.md

@@ -119,6 +119,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - Other Changes
     - Add fields `ChafFullInfo::{has_visible_history, accent_color_id, background_custom_emoji_id, profile_accent_color_id, profile_background_custom_emoji_id}`
   - Add `RequestId` type
+  - Add `CallbackQuery::regular_message` getter
 
 [pr851]: https://github.com/teloxide/teloxide/pull/851
 [pr887]: https://github.com/teloxide/teloxide/pull/887

crates/teloxide-core/src/types/callback_query.rs

@@ -60,13 +60,15 @@ impl CallbackQuery {
         use crate::util::flatten;
         use std::iter::once;
 
-        once(&self.from).chain(flatten(
+        once(&self.from).chain(flatten(self.regular_message().map(Message::mentioned_users)))
+    }
+
+    #[must_use]
+    pub fn regular_message(&self) -> Option<&Message> {
         self.message
             .as_ref()
             // If we can access the message
             .and_then(|maybe| maybe.message())
-                .map(Message::mentioned_users),
-        ))
     }
 }