id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
1953	Changes lost during upload break (abort or server error)	anonymous	framm	"JOSM v1181.

Found because today the OSM servers have been a little slow;  JOSM is timing out, eg.  

  upload to: http://www.openstreetmap.org/api/0.5/way/16478150... timed out, retries left: 10

If the upload is then cancelled by pressing ""[Cancel]"", then that one change that was being uploaded is marked as sent (there after ""No changes to upload""), when in fact the change hasn't been confirmed as sent.

As it is marked as already-sent, JOSM will not attempt to upload that one change again and it gets lost.
"	defect	closed	minor		Core	latest	worksforme	undo list erase to early