ReloadItem() may cause a hang

[hk05]

ReloadItem() may cause problems (i.e. hang on large number of items).
Instead of ReloadItem(), use reloadData(forRowIndexes:columnIndexes:)

Motivation

OutlineView.swift, line 49 -> reloadItem()
This code may cause a hang (spinning wheel).

Desired solution

Replace line 49, reloadItem() with:
reloadData(forRowIndexes: IndexSet(integer: row(forItem: item)), columnIndexes: IndexSet(0 ..< numberOfColumns))

Considered alternatives

Additional context