[graf] Warn user about automatic overwrite of TCutG if same name #17553
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This Pull request:
Changes or fixes:
Warn user about automatic overwrite of TCutG if same name
As done also in TDirectory::Append or when constructing a TH1
Suggested by https://root-forum.cern.ch/t/resolved-report-bug-lack-of-warning-with-crash-for-multiple-tcutg-object-having-the-same-name/62774/5
Checklist: