src/vs/workbench/contrib/debug/browser/loadedScriptsView.ts/BaseTreeItem/isSkipped
class BaseTreeItem:	isSkipped(): boolean {
		if (this._parent) {
			if (this._parent.oneChild()) {
				return true;	// skipped if I'm the only child of my parents
			}
			return false;
		}
		return true;	// roots are never skipped
	}