Pasting removes space

[rugk]

Expected Behavior

This is Threema Web on GitHub: https://github.com/threema-ch/threema-web is send.

Current Behavior

This is Threema Web on GitHub:https://github.com/threema-ch/threema-web is send.

The bad thing is, that this makes the link unclickable in the app. (in Threema Web is is still clickable, FYI)

Possible Solution

Maybe caused by fixing #134?

Steps to Reproduce (for bugs)

1. First "write" something ending with (at least) one space. (Actually you can also paste it…) E.g.: This is Threema Web on GitHub: (<-- Note that there is a space at the end, which is also stripped by GitHub here 😢 )
2. Now paste something else in there, e.g. a link. (https://github.com/threema-ch/threema-web)
3. Everything looks right, but now press enter.

Your Environment

• Threema Web version: 1.2.1
• Browser name and version: Firefox 53.0.2

[dbrgn]

Thanks, in contrast to #229 I can reproduce this :) Yes, it's a regression introduced by #219.