Reply by email in issue tracker does not work properly when reply contains quotes (BB-9986)

I tried to use reply by email a several times and got the following problems:

1. Mails 1, 2 and 4 were just not posted.
2. Mail 3 was truncated to

#*

Given that original message looks like

header
Text1
Text2
Text3
footer

(header and footer are generated by issue tracker when it was sending the message) first mail looks like

reply-header
> header
> Text1

reply1

> Text2

reply2

> Text3
> footer

(here reply-header is generated when I hit “Reply” button and looks like {{

,

, "

", <

>":}}), second mail looks like this:

reply0

reply-header
> Text1

reply1

> Text2

reply2

> Text3
> footer

, third looks like

reply0

> Text1

reply1

> Text2

and fourth looks like

reply2.0

> ! Text2.1 !
> > !reply1!
> ! Text2.2 !

reply2.1

> ! Text2.3!
> > !reply2!
> ! Text2.4 !

reply2.2