Before I describe this problem, let me describe my configuration. I am running Linux MINT on an Apple iMac. There is no Apple software on this machine. Firefox is my browser of choice. -Enter key-
This is a new line. I now see three lines above, word-wrap after 'Linux', and after 'is my' with no extra blank lines. -Enter key-
Now I preview my typing, and there are blank lines added after each -Enter key-
Have not seen this CR-LF problem since using DOS & WordPerfect (circa 1985).
CarriageReturn & LineFeed.
This is the 10th line. Count 'em. Oh, you counted 15 ?
This is the end of this problem.