src/vs/workbench/contrib/files/browser/views/explorerView.ts/ExplorerView/itemsCopied
class ExplorerView:	itemsCopied(stats: ExplorerItem[], cut: boolean, previousCut: ExplorerItem[] | undefined): void {
		this.fileCopiedContextKey.set(stats.length > 0);
		this.resourceCutContextKey.set(cut && stats.length > 0);
		if (previousCut) {
			previousCut.forEach(item => this.tree.rerender(item));
		}
		if (cut) {
			stats.forEach(s => this.tree.rerender(s));
		}
	}