Unreaded posts in channels

[okopok]

Steps to reproduce

1. Have channel with unread posts
2. Opening this channel - clear all unread posts counter
3. When you opening channel after restart Tdesktop, you are on bottom of this channel.

Expected behaviour

Starts from first unread posts

Actual behaviour

Starts from the last post

Configuration

Operating system:
Windows 10 - 1809
Version of Telegram Desktop:
1.5.15
Used theme:
custom theme

When channel has more than 1k+ unread posts, opening this channel with tdesktop makes all unread posts as readed. And after this, you opening channel again, and see only the last post, even on mobile telegram. Please make read counter like on telegram for mobile devices, when you are open channel and start to see only real unread posts.

[23rd]

Duplicate of #775.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.