When working with a long document in the editor, copy and pasting text jumps the editor around.  Many times it jumps all the way to the top of the document and it's very inconsistent the way where the page jumps to after pasting.  I tried it on the demo site and it happens a few times but it's very hard to reproduce.  Is there a fix for this? Or maybe a way I can configure the editor to minimize jumping around?  Thanks.