displays infobar if a #REF! Error is encountered

[ferdiga]

Deleting a referenced cell causes an #REF! error in the formula WITHOUT user feedback



Required user feed back

• Display DANGER info bar with cell reference of the first referencing cell
• Remove Info bar on UNDO (and re check ?)
• Make it thread safe using broadcast


Current status

• thread proof implementation using broadcast

ToDo

• needs 2 UNDO clicks to revert, as the creation of the InfoBar is considered as own UNDO
• implement an option or automatic to check for dirty sheets with #REF! Errors
  


[github-actions]

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