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

[matt rice]

Follow-up Comment #2, bug #29892 (project gnustep):

iirc the intent was removing duplicate code and letting it fall back to the
super's implementation, when I was doing the whole rewrite of the NSTableView
selection tracking, so I didn't have to make bugfixes in subclasses, Its very
well possible I missed a difference between the 2, such as the bug described
here.

so it is possible that you may be able to re-add the code, but also possible
that it requires the same changes to mirror those which were made to
NSTableView

anyhow, the way I remember it is that the code was the same between
NSTableView and NSOutlineView except for one detail, which is the way in which
NSTableView and NSOutlineView figure out the number of rows, and so I added a
private method to NSTableView which it calls on self, and NSOutlineView then
overrides it

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