No warning upon exiting JOSM with unsaved data after failed upload

[framm]

Ed Loach reported a problem on the dev list which was mainly about JOSM not noticing a concurrent deletion and thus not uploading (we have open tickets for that), but also said in

​http://lists.openstreetmap.org/pipermail/dev/2009-May/015454.html

that even though is upload failed, he did not get a warning message on exiting JOSM and subsequently lost his edits.

A JOSM version number was not given.

[Gubaer]

Probably related to #2437.

Error messages due to failed upload are easily overlooked because they are not displayed with an error icon and because they often don't include the word "Error". A typical message is version mismatch provided 4, server had: 5 of way 123456789.

There isn't clear warning either that the data wasn't saved on the server.

[Gubaer]

This is most likely solved in the meantime.

In r2025 a new approach for checking for unsaved modifications before exiting JOSM was introduced.