問題タブ [progressmonitor]

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java - Parallel Stream with Progressmonitor opens multiple dialogs

I have a strange behavior I cannot explain.

Please have a look at this minimal example:

When executing this, you'd normally expect that a ProgressMonitor will come up and show the progress of the execution.

But this is how it really looks like: Screenshot

It seems that for every parallel stream executions there is one ProgressMonitor instance extra showing up.

Is there a reason for this? How can I achieve that only one dialog shows up and shows the progress?