Update to 1.0.29 on fedora 25, 4K display
The tray icon and the menu should scale up like the rest of the gui.
The tray icon is too small.
Operating system:
Fedora 25
Version of Telegram Desktop:
1.0.29
Used theme:
Default
Logs:
The Qt tray icon doesn't appear to support HiDPI displays. It was working fine before. Now the icon itself and the menu is kinda tiny.
Example picture showing Keybase, Telegram and Pamac.

Running on Gnome, 3200x1800 resolution.
Yeah, have the exact same problem. I should have provided a screenshot too, thanks.
Ubuntu 16.04


@ElvisPresly That looks really awful!
@ElvisPresly #2230
here's my screenshot on linux mint with cinnamon

That Dropbox icon tho
Deepin 15.5

News on this?

Latest Manjaro Gnome, 4k HiDPI screen on Dell XPS 15 9560.
Still happening with Fedora 27, Gnome 3.26 on Asus Zenbook UX501VW 4K HiDPI screen. Telegram version 1.2.6.
Same issue on Mint 18.3 with 4K screen (Dell XPS 15)
getting a low-res tray icon on Arch Linux as well (14" 1440p @ 1.5 scaling)
without unread msg count:

with unread msg count:

Ubuntu 18.10
Screen resolution 2736x1824
I have a low res icon which also looks a bit stretched vertically

I can confirm this issue using Linux Mint 19.2 on a Thinkpad X1 Yoga 4th Gen with a 14" 4K Display.

Isn't it possible to replace the PNG-Icons with SVG-Icons?
I can confirm this is an issue in 1.8.4 under Solus 4-current as well
Confirming on Manjaro Cinnamon current.
Most helpful comment
@ElvisPresly That looks really awful!