If MTBL_TREE_FLAG_AUTO_NORM_HIER is set, this message is sent just before a row is hidden, shown or deleted.
Number of the row
Reason for normalizing:
1 = row is being deleted
2 = row is being hidden ( by setting MTBL_ROW_HIDDEN )
3 = row is being shown ( by removing MTBL_ROW_HIDDEN )
To avoid normalizing, return MTBL_NODEFAULTACTION.
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