JOSM keeps uploading despite the upload dialog being closed

[avarab@…]

1. Upload a changeset with nodes that have already been deleted on the server
2. Press [X] on the upload dialog
3. JOSM keeps uploading

Here's what it showed in its status dialog. Everything after the first 2 POST operations was done after the upload dialog had been closed. So there was no GUI indication that JOSM was uploading in the background.

PUT http://api.openstreetmap.org/api/0.6/changeset/create... OK
POST http://api.openstreetmap.org/api/0.6/changeset/2862483/upload... Gone
Error header: The way with the id 26386116 has already been deleted
Warning: primitive 'highway (2 hntar) [id: 26.386.116]' is already deleted on the server. Skipping this primitive and retrying to upload.
PUT http://api.openstreetmap.org/api/0.6/changeset/2862483... OK
POST http://api.openstreetmap.org/api/0.6/changeset/2862483/upload... Gone
Error header: The way with the id 26386115 has already been deleted
Warning: primitive 'highway (2 hntar) [id: 26.386.115]' is already deleted on the server. Skipping this primitive and retrying to upload.
PUT http://api.openstreetmap.org/api/0.6/changeset/2862483... OK
POST http://api.openstreetmap.org/api/0.6/changeset/2862483/upload... Gone
Error header: The way with the id 26386114 has already been deleted
Warning: primitive 'highway (10 hntar) [id: 26.386.114]' is already deleted on the server. Skipping this primitive and retrying to upload.
PUT http://api.openstreetmap.org/api/0.6/changeset/2862483... PUT http://api.openstreetmap.org/api/0.6/changeset/2862483... OK
POST http://api.openstreetmap.org/api/0.6/changeset/2862483/upload... Gone
Error header: The way with the id 26386108 has already been deleted
Warning: primitive 'highway (52 hntar) [id: 26.386.108]' is already deleted on the server. Skipping this primitive and retrying to upload.
PUT http://api.openstreetmap.org/api/0.6/changeset/2862483... OK
POST http://api.openstreetmap.org/api/0.6/changeset/2862483/upload... Gone
Error header: The way with the id 26386096 has already been deleted
Warning: primitive 'highway (2 hntar) [id: 26.386.096]' is already deleted on the server. Skipping this primitive and retrying to upload.
PUT http://api.openstreetmap.org/api/0.6/changeset/2862483... OK 
POST http://api.openstreetmap.org/api/0.6/changeset/2862483/upload... Gone
Error header: The way with the id 28642924 has already been deleted
Warning: primitive '28 hntar [id: 28.642.924]' is already deleted on the server. Skipping this primitive and retrying to upload.
PUT http://api.openstreetmap.org/api/0.6/changeset/2862483... OK
POST http://api.openstreetmap.org/api/0.6/changeset/2862483/upload...

[Gubaer]

Should be fixed in r2319. Call to cancel() was missing when the progress monitor window was closed.