[BEGIN]
Do not notify users when taking screenshots in secret chat.
Tested on v5.15.
Warning: if you apply this patch to Telegram versions different from 5.15, test it with a friend before relying on it, as the patch might be applied correctly, but not being effective: if after patching you get patch n.2 and n.3 applied, but n.1 has not been applied, you will be able to take screenshots, but the screenshot notification message will be sent. Any other errors combination SHOULD just result in not being able to take screenshots in private chats.
StephenP, Mobimart Italia

[PACKAGE]
[CLASSES]
{"group": "1"}
{"original":"59 00 00 00 20 90 ?? 18 39 00 ?? ?? 0E"}
{"replaced":"59 00 00 00 20 90 ?? 18 33 00 ?? ?? 0E"}
{"group":"2"}
{"original":"39 01 ?? ?? 6E 10 74 00 0A 00 0C 01 13 02 00 20"}
{"replaced":"32 S1 ?? ?? 6E 10 74 00 0A 00 0C 01 13 02 00 20"}
{"group":"3"}
{"original":"38 01 ?? ?? 6E ?? ?? ?? ?? ?? 0C 00 39 00 ?? ?? 28 ?? 13 00 00 20 38 02"}
{"replaced":"32 S1 ?? ?? 6E ?? ?? ?? ?? ?? 0C 00 39 00 ?? ?? 28 ?? 13 00 00 20 38 02"}
[END]
Patch applied correctly! Hopefully it also works as expected XD