osx - NSOutlineView selected item move -


i have nsoutlineview has 2 groups , select 1 item when init. when click headercell , let 1 group collapse , other expand, selected item moves next group. why happen?

how can improve , make selected item not move?

update: happens when cell move outside nsoutlineview.so guess problem cell reuse.

update: before

enter image description here

after:

enter image description here

update: problem nsoutlineview's index of row changes when outlineview collapses or expands.


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