GtkTreeItem::collapse
Hides the node's subtree and emits the "collapse"
signal. When collapsed the icon to the left of the node changes from a -
(minus) to a + (plus).
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Every normal man must be tempted at times to spit upon his hands, hoist the black flag and begin slitting throats.It's a funny thing about life; if you refuse to accept anything but the best, you very often get it.
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