JarViewer: Fix orphaned temp files (remove background jobs) #6342
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Closes #6340
this fixes all the race conditions where update methods was called multiple times by different threads and created temp folders multiple times. Now only one temp folder per opened jar is created. Also did not notice a performance problem when opening the jar.
Not sure if not using a Background Job is a good or bad to do in Eclipse. But I had the feeling they do more harm than good in this case.