1. Added support for copy&pasting universal items (from other apps to Telegram and from Telegram to other apps): URL's, strikethrough, bold, italic, bold+italic, monospaced https://github.com/iTaysonLab/Telegram-1/commit/862bb25113a1fee6a9827a3933a1d5bee8bd121c
2. Fixed removing formatting when creating a link (enables link formatting) https://github.com/iTaysonLab/Telegram-1/commit/69d7e31c3c7ac65b34dab55f7ed240938278d41d
3. Fixed sending a universal formatted text https://github.com/iTaysonLab/Telegram-1/commit/bf512511b607a285f642a186b5ffbe7d285d30c5
4. Rewrtitten attachment camera backend to CameraX, featuring: full-featured photo/video recording, lens change, flash mode change, pinch2zoom and tap2focus gesture support (needs to be toggled from Debug Menu) <a lot of commits, starting with “camerax:”>

5. Implemented a QR Code reader inside CameraX backend, allowing users to scan a proxy QR to add it (was in iOS from December 2018, but not implemented in Android even now) https://github.com/iTaysonLab/Telegram-1/commit/978a09c6d700626c81c781db0ebd84c17de1b4b5
6. Biometrics support on login (face or iris scanner, tested on One UI and LineageOS 18.1, Galaxy S9+) [Android 9 or up, if earlier - older fingerprint implementation is used] https://github.com/iTaysonLab/Telegram-1/commit/260efaa1d1ef55134e98f74826c73a69def3c7d0
7. Rewritten fragment and drawer opening/close animation to use AndroidX DynamicAnimation https://github.com/iTaysonLab/Telegram-1/commit/761b20a906f006f7528bdb58dd9e94919fa7febf
8. Increased smoothness of swipeback https://github.com/iTaysonLab/Telegram-1/commit/209f426e0aae3a9ebcd4b528af78944c2167126b

9. Implement full theme support for Voice Chats (tested on everything: light+dark, prebuilt+custom) https://github.com/iTaysonLab/Telegram-1/commit/e21066b2af270010835d9d35f41a25fbae4e52b6
10. Fix volume slider out-of-bounds issue when on lower values in Voice Chats https://github.com/iTaysonLab/Telegram-1/commit/70500a496b0841ae44ca31defad91d2dbf89a1aa
11. Fix chatlist divider out-of-bounds issue when on corners of the list in Voice Chats https://github.com/iTaysonLab/Telegram-1/commit/973fa5a9dbd5f8dda9e96fd93638ee7836ad4e49
12. "Ask to Call" is now works everywhere, with improved UI and "Do Not Ask Again" option https://github.com/iTaysonLab/Telegram-1/commit/d783ea6010bc148471924785701a6a1cfdd7c0b5
13. "Delete Chat" UI improvement: message's margin is now aligned to avatar https://github.com/iTaysonLab/Telegram-1/commit/69d7e31c3c7ac65b34dab55f7ed240938278d41d

14. Chat: fix being able to report verified chats or chats where you is an admin https://github.com/iTaysonLab/Telegram-1/commit/207bd2133e75cb1f0af7bcb9d3f359cf23d448ef + https://github.com/iTaysonLab/Telegram-1/commit/937dfed8ad2fe19a24bbbe75d5f6b8e8d37fc9d3
15. Action mode for chats: now typing anything into searchbar will hide calendar/user buttons, as it is made on iOS (to prevent clearing the textfield when picking a user) https://github.com/iTaysonLab/Telegram-1/commit/f4fddd5e32cb4cd3a9a0e130213df6efe2b79a8e
16. Android 11 Bubbles: now chat icon is showing (also fixes notification large icon) https://github.com/iTaysonLab/Telegram-1/commit/86c72dd535d1e19f59da2e137035598d52f0598e
17. Fix rare image load crash when opening Android 11 Bubbles. https://github.com/iTaysonLab/Telegram-1/commit/0d2f2596601b422a7cebf7c332463885d82dc9b4

18. Fix freezes in "Documents" attachment picker - on loading "Recent Files" and on browsing the filesystem when using Android 11 (due to forcing SAF) https://github.com/iTaysonLab/Telegram-1/commit/bcb7d29fc83a6a6c14c5cbd4cdc075525b711c16
19. Migrate music player to MediaSessionCompat/NotificationCompat, fixing not active session (fixing Telegram not showing on One UI's lockscreen) https://github.com/iTaysonLab/Telegram-1/commit/3ab1faefbde02a9f752f280cd89fd335108fe9b5 and https://github.com/iTaysonLab/Telegram-1/commit/f18344822e88112c7e80d097366b28c9dd8a07b3
20. Fix empty artist on media session receivers (like One UI's lockscreen) https://github.com/iTaysonLab/Telegram-1/commit/3ab1faefbde02a9f752f280cd89fd335108fe9b5
21. Fix invalid queue order on Android Auto https://github.com/iTaysonLab/Telegram-1/commit/a1e5f4ac8b993e9c3de493e45c87b742d3fc18c7

22. Fix not updating MediaSession elapsed time after in-app seeking (for example, notification seekbar on Android 10+ is not updated when you seek in Telegram) https://github.com/iTaysonLab/Telegram-1/commit/8181bcbbaf64145c88c98b162057be4e7b672712
23. Increase instant videos quality from not appealing 240p to seems-as-normal 360p (with increased bitrate from 400000 to 600000) https://github.com/iTaysonLab/Telegram-1/commit/f8442bb5ed59dbd84ba47dbc3b88652ac51ccb2a
24. Fix enabling "Speaker" VoIP calls option instead of leaving "Earpiece" mode when starting a call on some Android phones https://github.com/iTaysonLab/Telegram-1/commit/be60611dec454ac124116dab443715b8f9ecb190
25. Implement opening fullscreen avatar viewer on header overscroll, because long-tapping avatar is not intuitive (like on iOS) https://github.com/iTaysonLab/Telegram-1/commit/7204f1393eac24a149ea5356408391ee7ad58f21

Below are fixed bugs, which were taken from bugs.telegram.org:

26. The group name should not be in the mention list (https://bugs.telegram.org/c/939) https://github.com/iTaysonLab/Telegram-1/commit/82422619245c3fc33cae06beddaa55b57ad61c82
27. Voice Messages become jerky when an Animated Emoji with sound is pressed (https://bugs.telegram.org/c/962) [fixed by not playing emoji sound while voice is playing!] https://github.com/iTaysonLab/Telegram-1/commit/3edd89fe803c80216a70cd85f116ecc355cc5753
28. Invalid "Manage Calls" admin right visibility in "Recent Actions" (https://bugs.telegram.org/c/1030 and https://bugs.telegram.org/c/1031) https://github.com/iTaysonLab/Telegram-1/commit/441ee944fb645c2cc69881f9f3ba91afc400e7e1
29. "Voice Chats" recent actions filter is available in channels (https://bugs.telegram.org/c/1341) https://github.com/iTaysonLab/Telegram-1/commit/53c01fb3c82d51237542b68abaa2e0aea6d28ed7

30. Fix isDark attribute for cloud themes (partially fixes https://bugs.telegram.org/c/923) https://github.com/iTaysonLab/Telegram-1/commit/caf3b9cd5ffb9e1ee0a216a7686bc67ae07a92bb
31. Broken playlist ordering when played from chat (https://bugs.telegram.org/c/792) https://github.com/iTaysonLab/Telegram-1/commit/f0124feb8e5ba6e4de7b061c5e74591a2280d7f2
32. Pencil icon is visible for files in preview (https://bugs.telegram.org/c/1177) https://github.com/iTaysonLab/Telegram-1/commit/0461c95fd0fe33cb2fa71e3ecb33db38e9865ec3
33. User can delete service messages even if he is not an admin (https://bugs.telegram.org/c/1371 and https://bugs.telegram.org/c/1202) https://github.com/iTaysonLab/Telegram-1/commit/9404e8f08268fac8f3f183bdc0f0d1fa6bd1cbe3
34. Cropping conflicts with Android 10+ gestures (https://bugs.telegram.org/c/1557) [only part of the side is fixed, other is not touched due to Android restrictions] https://github.com/iTaysonLab/Telegram-1/commit/3d8fa85b519a1008de0cf0ced10c854129e7b28b

35. Messages action mode: when clicking on second message and fast-clicking first one, "Reply" button won't show back (https://bugs.telegram.org/c/1575) https://github.com/iTaysonLab/Telegram-1/commit/392945b8e554e731bbce438e17c1ddc752f7581b
36. System emoji is shown when writing caption for attachments (https://bugs.telegram.org/c/1331) https://github.com/iTaysonLab/Telegram-1/commit/502c8da3a04bf649af684890f8acb100c94565b7
37. Message's reply header is not updated or deleted when root reply message is changed (https://bugs.telegram.org/c/179 and https://bugs.telegram.org/c/561) https://github.com/iTaysonLab/Telegram-1/commit/6809c3081319f852d95913dd0b72cee08e39c63c + https://github.com/iTaysonLab/Telegram-1/commit/7c2964be9aa241043aadabd96c35e6c681ad7cfc
38. Not possible to search member's messages if muted in chat (https://bugs.telegram.org/c/859) https://github.com/iTaysonLab/Telegram-1/commit/ae9ee72a77298d1adb44b949b184463d921dfb82

39. Preserve timestamps when copying messages (https://bugs.telegram.org/c/462) https://github.com/iTaysonLab/Telegram-1/commit/3a7826300cef1aeb3ec5f1d6f5c31b1e77535a20
40. Fix being able to ban users in VoIP group calls without having ban permission (https://bugs.telegram.org/c/927) https://github.com/iTaysonLab/Telegram-1/commit/8b2bc972c3999e72dc6686ebdc1809ef45f26dff

Also, below are accessibility improvements for TalkBack/screen readers users:

41. Improved accessibility for passcode setup: EditText's have now a hint, and PIN/Passcode toggle has a content description tag https://github.com/iTaysonLab/Telegram-1/commit/d44b20ed9470f37f5e8e47a58b85d6e5cb2ad507
42. Fixed inverted Day/Night theme toggle label for TalkBack https://github.com/iTaysonLab/Telegram-1/commit/61806f8dbb12727cc464ffb27983205cbb230d4d

43. Invite Links: fixed "..Text" issue in Copy Link/Share Link/Revoke Link buttons https://github.com/iTaysonLab/Telegram-1/commit/a19bb750c4bef7cdaa7352652262a7ee12254a4c
44. Invite Links: fix unlabeled "Link Options" button https://github.com/iTaysonLab/Telegram-1/commit/a19bb750c4bef7cdaa7352652262a7ee12254a4c
45. 2FA/Transfer: fix unlabeled "Enter password" EditText https://github.com/iTaysonLab/Telegram-1/commit/7b4b75c1042f515aa7821e7335ea57ca834a7afc

Общее число исправлений: 45
Число корректных исправлений: 32

Отметим исследование приложения и как последующие исправления для самостоятельно найденных багов, так и большое число качественно реализованных улучшений в разных частях приложения. В работе также реализовано несколько новых функций, включая поддержку CameraX и биометрии. 

К сожалению, не все внедрённые исправления могут быть засчитаны из-за их некорректной имплементации:

#4. CameraX. При первом запуске на Samsung J7 (Android 9) приложение вылетает. Каждое касание экрана для фокусировки вызывает включение вспышки. 
#5. Сканирование QR-кодов в камере не срабатало на устройствах, используемых в тестировании. 
#8. Анимации перехода назад. Из-за сокращенного расстояния могут начать возникать случайные смахивания. 
#9. Поддержка тем для голосовых чатов. Замена специальных ключей для голосовых чатов общими не является корректным решением. 
#14. В приложении должна быть возможность пожаловаться на верифицированные чаты.
#23. Увеличение разрешения и битрейта увеличит размер видеосообщений. Такой способ увеличения качества видео не является корректным. 
#25. Открытие фотографии профиля в просмотрщике. Если в профиле несколько фотографий, то таким образом всегда открывается первая фотография. 
#26. Вывод группы в списке упоминаний. Подобная реализация неверная, так как может влиять на существующую функциональность приложения, а именно некоректно осуществлять поиск по сообщениям анонимных администраторов.
#27 Воспроизведение голосового сообщения и emoji со звуком. Проблема должна быть исправлена в ExoPlayer
#29. Фильтрация голосовых чатов в Recent Actions каналов. Решение может привести к поломке вёрстки и падениям приложения. 
#32. Кнопка редактирования у файлов. После внедрённого исправления кнопка исчезла у фотографий. 
#34. Срабатывание жестов при редактировании видео. В крайних положениях жесты всё ещё срабатывают. 
#43-44. В меню групп исчез пункт редактирования ссылок. 

You better split all these changes into separate comments here. At least for clickable links