Crash on OSX when viewing a message containing "\u180e\u2061" in code or pre tags

[udf]

Steps to reproduce

1. Copy and send the following text in a message (surround it in ``):
   ]᠎⁡[
   (there are two zero width characters between the "]" and "[")
2. View the message from tdesktop on OSX

Additionally, you can swap the order of the two zero width characters and it still crashes. If the message is deleted in a supergroup, viewing the admin log causes the same crash.

Expected behaviour

The chat where the message was sent can be read as normal.

Actual behaviour

tdesktop crashes. The message has to be deleted to make tdesktop usable again.

Configuration

Operating system: Mac OS X 10.13.4

Version of Telegram Desktop: 1.2.15

Used theme: Default

A crash report is attached as the logs don't seem to contain anything useful.
Telegram_2018-03-30-144411_Yoricks-MacBook-Pro.crash.txt

[john-preston]

@udf Thanks, it crashes me even through GitHub bot message with your report 🙈

[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.