DownloadWmsAlongTrackActionTest.testTMSLayer fails on GitHub Actions

[simon04]

Any idea why DownloadWmsAlongTrackActionTest.testTMSLayer fails on GitHub Actions? – ​https://github.com/openstreetmap/josm/runs/2226030659

org.openstreetmap.josm.gui.progress.ProgressException: Expected states are [IN_TASK, IN_SUBTASK] but current state is FINISHED
	at org.openstreetmap.josm.gui.progress.AbstractProgressMonitor.checkState(AbstractProgressMonitor.java:84)
	at org.openstreetmap.josm.gui.progress.AbstractProgressMonitor.internalUpdateProgress(AbstractProgressMonitor.java:266)
	at org.openstreetmap.josm.gui.progress.AbstractProgressMonitor.setTicks(AbstractProgressMonitor.java:244)
	at org.openstreetmap.josm.gui.progress.AbstractProgressMonitor.worked(AbstractProgressMonitor.java:258)
	at org.openstreetmap.josm.gui.layer.AbstractTileSourceLayer$PrecacheTask.tileLoadingFinished(AbstractTileSourceLayer.java:1910)
	at org.openstreetmap.josm.data.imagery.TMSCachedTileLoaderJob.loadingFinished(TMSCachedTileLoaderJob.java:219)
	at org.openstreetmap.josm.data.cache.JCSCachedTileLoaderJob.finishLoading(JCSCachedTileLoaderJob.java:261)
	at org.openstreetmap.josm.data.cache.JCSCachedTileLoaderJob.run(JCSCachedTileLoaderJob.java:230)
	at java.base/java.lang.Thread.run(Thread.java:831)

[Don-vip]

These errors are the hard ones. No idea right now...

[simon04]

@wiktorn, could this be related to r17494?

cachedTileLoader.cancelOutstandingTasks(); cachedTileLoader.shutdown(); is called for each loaded tile via PrecacheTask.tileLoadingFinished (9 times for DownloadWmsAlongTrackActionTest.testTMSLayer).

[Don-vip]

In 17975/josm:

fix #21090 - fix #20695 - shutdown precache tileloader only when all tiles have been loaded