The problem only happens with short lines, where the editor wraps a paragraph, leading it to fit as many words as it can into each line.
aaaaaaaaaaaaaaaaaaaaaaaaaa
bbbbbbbbbbbbbbbbbbbbbbbbbb
cccccccccccccccccccccccccc
Take this and block quote it:
aaaaaaaaaaaaaaaaaaaaaaaaaa bbbbbbbbbbbbbbbbbbbbbbbbbb cccccccccccccccccccccccccc
The editor actually produced:
> aaaaaaaaaaaaaaaaaaaaaaaaaa bbbbbbbbbbbbbbbbbbbbbbbbbb
> cccccccccccccccccccccccccc
So, yes, we could fix the editor to not do wrapping when quoting. The editor also messes up when unquoting:
> aaaaaaaaaaaaaaaaaaaaaaaaaa
> bbbbbbbbbbbbbbbbbbbbbbbbbb
> cccccccccccccccccccccccccc
Becomes, on unquoting:
aaaaaaaaaaaaaaaaaaaaaaaaaa bbbbbbbbbbbbbbbbbbbbbbbbbb cccccccccccccccccccccccccc
aaaaaaaaaaaaaaaaaaaaaaaaaa bbbbbbbbbbbbbbbbbbbbbbbbbb cccccccccccccccccccccccccc
Yes, this is an editor "feature".