src/vs/workbench/browser/parts/views/treeView.ts/AbstractTreeView/initializeCollapseAllToggle
class AbstractTreeView:	private initializeCollapseAllToggle() {
		if (!this.collapseAllToggleContext) {
			this.collapseAllToggleContextKey = new RawContextKey<boolean>(`treeView.${this.id}.toggleCollapseAll`, false, localize('treeView.toggleCollapseAll', "Whether collapse all is toggled for the tree view with id {0}.", this.id));
			this.collapseAllToggleContext = this.collapseAllToggleContextKey.bindTo(this.contextKeyService);
		}
	}