src/vs/workbench/browser/parts/views/treeView.ts/AbstractTreeView/initializeShowCollapseAllAction
class AbstractTreeView:	private initializeShowCollapseAllAction(startingValue: boolean = false) {
		if (!this.collapseAllContext) {
			this.collapseAllContextKey = new RawContextKey<boolean>(`treeView.${this.id}.enableCollapseAll`, startingValue, localize('treeView.enableCollapseAll', "Whether the the tree view with id {0} enables collapse all.", this.id));
			this.collapseAllContext = this.collapseAllContextKey.bindTo(this.contextKeyService);
		}
		return true;
	}