[bug #29892] Outline view selected item highlighting not preserved when collapsing/expanding

[Wolfgang Lux]

Follow-up Comment #6, bug #29892 (project gnustep):

I have just committed a fix for this bug. I tried to match Cocoa's behavior
as closely as possible. In particular, the changes attempt to ensure that the
outline view is in a consistent state whenever a notification is posted, i.e.,
an object that receives one of the notifications can ask the outline view for
the number of rows and selected row (indexes) and the returned values will
match the actual state.

Thus, even though I really see no point in doing that from a user's POV, it
would be possible for the delegate to implement the current behavior, i.e.,
preserve the selected row indexes when an item is collapsed or expanded –
just save the current indexes when receiving the will collapse (expand)
notification and restore when receiving the did collapse (expand)
notification.

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