do not cache incorrect login credentials

[jose1711]

What steps will reproduce the problem?

1. run josm, download any area and make a *valid* edit
2. make sure you do not have OSM credentials stored (OSM username and password is empty)
3. hit upload
4. enter your username and INCORRECT password
5. get an error message
6. now try to recover from this situation - upload again

What is the expected result?

josm should ask user/password combination on successive upload attempt

What happens instead?

it does not ask anything and just keeps showing the error message. the only remediation i found is to restart JOSM.

Please provide any additional information below. Attach a screenshot if possible.

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2017-10-03 21:43:00 +0200 (Tue, 03 Oct 2017)
Build-Date:2017-10-03 19:50:21
Revision:12921
Relative:URL: ^/trunk

Identification: JOSM/1.5 (12921 sk) Linux Arch Linux
Memory Usage: 336 MB / 1328 MB (108 MB allocated, but free)
Java version: 1.8.0_144-b01, Oracle Corporation, OpenJDK 64-Bit Server VM
Screen: :0.0 3744x1024, :0.1 1024x768, :0.2 1440x900
Maximum Screen Size: 3744x1024
VM arguments: [-Djosm.restart=true]

Plugins:
+ CommandLine (33368)
+ PicLayer (33385)
+ SimplifyArea (33004)
+ buildings_tools (33004)
+ freemapkapor (53)
+ reverter (33572)
+ undelete (33480)
+ utilsplugin2 (33704)

Last errors/warnings:
- W: No configuration settings found.  Using hardcoded default values for all pools.

[Don-vip]

In 12992/josm:

fix #15435 - do not cache incorrect login credentials when using basic auth

[Don-vip]

Ticket #15496 has been marked as a duplicate of this ticket.