Newlines aren't properly trimmed

[u9000-Nine]

Describe the bug

When there is more than one trailing/leading newline in a message, only the last/first one is removed before sending the message. This also occurs with multiple blank lines in the middle of a message.

Reproduction

1. Send the following message (line numbers added for clarity. remove before sending):

1
2
3 foo
4
5
6 bar
7
8

2. Observe that it sends the following:

1
2 foo
3
4
5 bar
6

Expected behavior

Newlines would be trimmed properly:

1 foo
2
3 bar

System info

OS: Windows 10
Browser: Helium version 0.9.4.1
Cinny version: v1.11.1 PWA

[u9000-Nine]

So they seem to be properly trimmed in body but not in formatted_body:

"content": {
  "body": "foo\n\n\nbar",
  "format": "org.matrix.custom.html",
  "formatted_body": "<br/><br/>foo<br/><br/><br/>bar<br/><br/>",
  "m.mentions": {},
  "msgtype": "m.text"
},