Multiline message with Shift+Enter

[derkaczda]

Is your feature request related to a problem? Please describe. It is not possible to write multiline messages in the chat without sending the line.

Describe the solution you'd like Other chat clients use for example Shift+Enter to get a new line without sending the message.

[Trattue]

This can be used to create really long messages despite having a message character limit, so probably consecutive line wraps should be ignored

[joschahenningsen]

@Trattue Good catch!

[joschahenningsen]

Let's track this in #747