We're not replacing nbsp with spaces when using X clipboard (Shift+Insert or middle mouse button).
Created attachment 192679 [details] Proposed patch
Comment on attachment 192679 [details] Proposed patch Thanks.
Comment on attachment 192679 [details] Proposed patch Clearing flags on attachment: 192679 Committed r145542: <http://trac.webkit.org/changeset/145542>
All reviewed patches have been landed. Closing bug.