deleting species from tree silently removes groups

[westram]

reproduce (1):

• load attached database group_delete.arb
• remove marked species from 'tree_test'
• effects:
  • removes group 'inner2' ( because all species were removed)
  • removes group 'outer' ( unwanted)

reproduce (2):

• remove marked species from 'tree_test_2'
  (=only one ungrouped species!)
• effects:
  • removes group 'outer' ( unwanted and very unexpected)

reproduce (3):

• remove marked species from 'tree_test_3'
  (=only one ungrouped species removed + no brother-group 'inner1' present)
• effects:
  • group 'outer' vanishes from , but
    • ACI command 'taxonomy' still "sees" the group
    • reloading the lets the group reappear

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reasons:

• (1)+(2): group 'outer' gets overwritten by group 'inner1'
• (3): no idea

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wanted behavior:

• (1)+(2): merge group names ("outer_inner1")
  • Note: the underscore is the recommended syntax to indicate that multiple taxonomy levels fall to the same node.
• (3): don't vanish

[westram]

use to reproduce bad behavior