Ending backslash in displayed user name breaks mention badge.

[ZoomRmc]

Description

Ending backslash in displayed user name breaks mention badge styling.

Steps to reproduce

• Change the displayed user-name to something that ends with the backslash, e.g. user\
• Mention such user
• Get [user](https://matrix.to/#/@user:matrix.org): displayed, instead of a styled badge

Version information

• Platform: Web, Android
  Checked in Firefox and Chrome.

• Version: Web: 0.12.1 Android: 0.7.00

[lukebarnard1]

Ah. We probably should escape user display names for inserting them into markdown.

[ZoomRmc]

Seems fixed in the web version.

[sandhose]

I have the same issue with someone that has a backtick in his username. The two backticks in the pill (once in the link, once in the text) are interpreted as an inline code block.

Tested on develop and on stable.

[grahamperrin]

/develop/

For an IRC user [ade] at https://matrix.to/#/!GdmnfkDxuKZAICnOhe:matrix.org/$15055010117354830ilAZn:matrix.org:

Seems fixed in the web version.

Maybe not, or not for me. https://matrix.to/#/!DgvjtOljKujDBrxyHk:matrix.org/$15054481726668574nPpFV:matrix.org for screenshots of a recent incident affecting an IRC user

Jan\

[sbts]

Definitely still an issue for backticks in Nicks.
see #5135 for another example.