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FolderChildren should provide the Please-wait node (as SourceChildren does). The childern calucated and added at once, not by packs.
For details see issue 30014.
Created attachment 8847 [details] Proposed patch for FolderChildren
Created attachment 8876 [details] Patch with 100 ms delay in displaying please wait node
Created attachment 8877 [details] Another patch - without the please wait node
I personally like the last patch the best. Please evaluate.
I have applied a patch very similar to the last proposed patch to the trunk. The please wait node is not there yet since we still have problems with fast enough redraw after the please wait node is removed.
I have changed the folder children to provide the semi-busy cursor (by implementing getNodes(true)). I hope this will be ok for NB 3.5. Closing this issue.