Open issues for TermCollection.allowDuplicates handling in TaxEditor
The error message currently looks like an unhandled error. The message should only inform about the fact that duplicates are not allowed and therefore the selected area could not be added. No stacktrace should be shown (and also no stacktrace should be created! in any logfile as this should be a handled case).
Also only 1 message should be shown if >1 terms are tried to be added which already exist.
copied from #8477: do not allow editing the flag if duplicates exist in the collection
when changing the title of the tree the part which handles the details view area which holds the 3 flags (allow duplicates, is flat and order relevant) becomes orange. As these flags are not relevant for the titleCache this should not be the case
"Paste" should not be available in context menu if the area already exists in the tree
d&d from 1 term tree to another in the same TermTreeEditor does currently not do the check (and therefore duplicates are possible), while d&d from e.g. term editor to term tree editor does check if duplicates exists (same way as described in first issue above)