I will post it too in case they have some minimum threshold before they will fix a bug.  It only took me 8 years to get a Maps bug partially fixed.

I also have this problem when pasting from Textastic into a gmail message.  My work around is to paste the text into iOS Notes or some other app that preserves the line feeds, then copy it from there and paste it into gmail.  Not sure why the line feed characters copied to the clipboard are different when they come from Textastic versus Notes, but if there is a way to examine the clipboard contents, that might offfer some clues as to what is happening.