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The finish of execution FolderChildren.getNodes(true) should signal that the all folder's children are calculated and added to Children. It helps to show/remove a progress cursor on TreeView (issue 30014)
Created attachment 8811 [details] Proposed patch to FolderChildren.java
If there is any problem with this patch, please reopen. I did not apply the patch to the trunk. It is up to you to decide whether it will be needed or not.