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All calls to explorer package should be only from AWT-queue. explorer and explorer/view package contains visualization of data thus calls and events must be from AWT. The change events in ExplorerManager are replanned to AWT-queue now but it can lead to a unexpected behavior.
See also issue 27462 - Some ExplorerViews do not conform to Swing Thread Model.
Will probably be fixed in issue #35833's branch.
Assigned to new owner.
Reassigning to new module owner Tomas Holy.
Probably no real benefits over current state.